help getting frames with display link

Hi all, I am working on an application that involves real time video
editing with Core Framework in Cocoa. For testing we basically have a
DVI cam hooked up to a Mac Book Pro and need to be able to edit the
stream it produces. I successfully got the video into quick time using
QTKit, but am having trouble aquiring the frames with a display link.
The example in the Core Video guide shows it initializing the video
source from file with this method:

* (id)initWithFilePath: (NSString*)theFilePath

, but I need to get the frames I can already access into the display
link for OpenGL rendering and Core Image effects. Right now i have it
output via QTCaptureView. But if I want to do openGL rendering/Core
Image effects on the frame does it need to be an NSOpenGLView? If
anyone has any ideas or advice I would greatly appreciate it. Thanks
in advance!

Here is what I have thus far....maybe it will help show where I am at
and hoping to go.

//
//  VideoDisplayController.m
//  Prototype492
//
//  Created on 3/7/08.
//

#import "VideoDisplayController.h"

@[EMAIL PROTECTED]
 VideoDisplayController

/*
    start the video capture session if it's not running
*/
- (IBAction)startVideoCapture:(id)sender
{

        if(![captureSession isRunning])
        {
            [captureSession startRunning];
        }

}

/*
    stop the video capture session if it's running
*/

- (IBAction)stopVideoCapture:(id)sender
{
    if([captureSession isRunning])
        {
            [captureSession stopRunning];
        }

}

/*
initialization of UI elements
*/
- (void)awakeFromNib
{
    NSLog(@[EMAIL PROTECTED]
"initializing video controller");

    if(!captureSession) {

        //creating capture session

        captureSession = [[QTCaptureSession alloc] init];

            //flags for connecting inputs and outputs
            BOOL successConnect = NO;
            NSError *error = nil;

            //finding and creating the input device and adding it to
the
capture session
            //if unsuccessful, send a message to error log

        //note: using QTMediaTypeMuxed for DV camera... otherwise use
QTMediaTypeVideo
        videoCaptureDevice = [QTCaptureDevice
defaultInputDeviceWithMediaType:QTMediaTypeMuxed];

            //if the video capture device is found, attempt to open it
and
add it to the capture session
        if(videoCaptureDevice)
            {
            successConnect = [videoCaptureDevice open:&error];

                    if(!successConnect)
                    {

                        NSLog(@[EMAIL PROTECTED]
"error opening video capture device");
                videoCaptureDevice = nil;

                        //other error handling code goes here
                    }

            captureVideoDeviceInput = [[QTCaptureDeviceInput alloc]
initWithDevice:videoCaptureDevice];

            //attempt to add capture device input to the capture
session
                    successConnect = [captureSession
addInput:captureVideoDeviceInput error:&error];

                    if(!successConnect)
                    {
                        NSLog(@[EMAIL PROTECTED]
"error adding video capture device
input to capture
session");

                            //other error handling code goes here
                }

            //adding decompressed video output to capture session

                        decompressedVideoOutput =
[[QTCaptureDecompressedVideoOutput alloc]
init];

                        //assigning delegate to decompressed video
output

                        [decompressedVideoOutput setDelegate: self];

                        successConnect = [captureSession
addOutput:decompressedVideoOutput
error:&error];

            if(!successConnect)
                        {
                            NSLog(@[EMAIL PROTECTED]
"error adding decompressed video
output to capture
session");

                                //other error handling code goes here

                        }

            //linking capture session to the capture view
                    [captureView setCaptureSession:captureSession];

                    //[captureSession startRunning];
            }
        else
            {
                NSLog(@[EMAIL PROTECTED]
"couldn't find video capture device");
            }
    }

}

/*
delegate method called when decompressedVideoOutput receives a frame
it is not called in the main thread, so a synhronized block is used
delegates of decompressedVideoOutput receive this message
and then can used the provided video frame for further image
processing

captureOutput - the QTCaptureDecompressedVideoOutput instance that
sent the frame (decompressedVideoOutput)
videoFrame - Core Video image buffer containing the decompressed frame
sampleBuffer sample buffer containing additional info about the frame
connection - connnection from which vdieo was received
*/

- (void)captureOutput:(QTCaptureOutput *)captureOutput
        didOutputVideoFrame:(CVImageBufferRef)videoFrame
        withSampleBuffer:(QTSampleBuffer *)sampleBuffer
        fromConnection:(QTCaptureConnection *)connection
{
    CVImageBufferRef releasedImageBuffer;

    CVBufferRetain(videoFrame);

    @[EMAIL PROTECTED]
(self)
        {
        //basically, have frame to be released refer to the current
frame
                //then update the reference to the current frame with
the next frame
in the "video stream"
            releasedImageBuffer = currentImageBuffer;
        currentImageBuffer = videoFrame;
        }

    CVBufferRelease(releasedImageBuffer);

}

/*
event that's fired when window is closed
stop the session and close any opened devices
*/
- (void)windowWillClose:(NSNotification *)notification
{
    if([captureSession isRunning])
        {
            [captureSession stopRunning];
    }

        if([videoCaptureDevice isOpen])
        {
            [videoCaptureDevice close];
        }

}

/*
event that fires when memory is to be deallocated when object is
killed
*/
- (void)dealloc
{

    [captureSession release];
        [captureVideoDeviceInput release];
    [decompressedVideoOutput release];

        [super dealloc];

}

@[EMAIL PROTECTED]
  VideoDisplayController.h
//  Prototype492v1.1
//
//  Updated on 3/8/08.
//

#import <Cocoa/Cocoa.h>
#import <QTKit/QTkit.h>
#import "VideoView.h"

@[EMAIL PROTECTED]
 VideoDisplayController : NSOpenGLView
{
    QTCaptureSession *captureSession;
    QTCaptureDevice *videoCaptureDevice;
        QTCaptureDeviceInput *captureVideoDeviceInput;
    QTCaptureDecompressedVideoOutput *decompressedVideoOutput;

    //stores most recent frame grabbed from a CVImageBufferRef
        CVImageBufferRef currentImageBuffer;

    //this is the panel on which the video from the DV camera will be
displayed
    IBOutlet QTCaptureView *captureView;

    //IBOutlet VideoView *openGLVideoView;

}

- (IBAction)startVideoCapture:(id)sender;
- (IBAction)stopVideoCapture:(id)sender;

@[EMAIL PROTECTED]