OpenCV pulling up the camera on iOS

// Set up the CV Video Camera object to bring in video to the program
    videoCamera = [[CvVideoCamera alloc] initWithParentView:self.imageView];
    videoCamera.defaultAVCaptureDevicePosition = AVCaptureDevicePositionBack;
    videoCamera.defaultAVCaptureSessionPreset = AVCaptureSessionPresetHigh;
    videoCamera.defaultAVCaptureVideoOrientation = AVCaptureVideoOrientationPortrait;
    videoCamera.defaultFPS = 30;
    videoCamera.grayscaleMode = NO;
    videoCamera.delegate = self;