CaptureTestAppDelegate.h

#import <Cocoa/Cocoa.h>
#import <QTKit/QTKit.h>
#import <QTKit/QTCaptureSession.h>
#import <QTKit/QTCaptureDeviceInput.h>
#import <QTKit/QTCaptureView.h>

@interface CaptureTestAppDelegate : NSObject <NSApplicationDelegate> {
    NSWindow *window;
	
    QTCaptureSession *mCaptureSession;
    QTCaptureVideoPreviewOutput *mCaptureVideoPreviewOutput;
    QTCaptureDeviceInput *mCaptureVideoDeviceInput;
	
    IBOutlet QTCaptureView *mCaptureView;
}

@property (assign) IBOutlet NSWindow *window;

@end

CaptureTestAppDelegate.m

#import "CaptureTestAppDelegate.h"

@implementation CaptureTestAppDelegate

@synthesize window;

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
    mCaptureSession = [[QTCaptureSession alloc] init];
    QTCaptureDevice *videoDevice = [QTCaptureDevice defaultInputDeviceWithMediaType:QTMediaTypeVideo];
    BOOL success = NO;
    NSError *error;
    success = [videoDevice open:&error];
    [videoDevice open:&error];

    mCaptureVideoDeviceInput = [[QTCaptureDeviceInput alloc] initWithDevice:videoDevice];
    success = [mCaptureSession addInput:mCaptureVideoDeviceInput error:&error];

    [mCaptureView setCaptureSession:mCaptureSession];
    [mCaptureSession startRunning];
    [mCaptureView setDelegate:self];
	
}

- (CIImage *)view:(QTCaptureView *)view willDisplayImage :(CIImage *)image;
{
    return image;
}


@end