iGriever

// Camera permission handling - iOS 8
[AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted){
    if (granted)
    {
        dispatch_sync(dispatch_get_main_queue(), ^{
            // Present camera controller here
        });
    }
    else
    {

iGriever

    // Setup horizontal motion effect
    UIInterpolatingMotionEffect *horizontalInterpolation = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"center.x" type:UIInterpolatingMotionEffectTypeTiltAlongHorizontalAxis];
    horizontalInterpolation.minimumRelativeValue = @-kMotionViewControllerInterpolationValue;
    horizontalInterpolation.maximumRelativeValue = @kMotionViewControllerInterpolationValue;
    
    // Setup vertical motion effect
    UIInterpolatingMotionEffect *verticalInterpolation = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"center.y" type:UIInterpolatingMotionEffectTypeTiltAlongVerticalAxis];
    verticalInterpolation.minimumRelativeValue = @-kMotionViewControllerInterpolationValue;
    verticalInterpolation.maximumRelativeValue = @kMotionViewControllerInterpolationValue;