High Performance CVPixelBuffer capture in Xamarin

capture.cs

Video Capture
previewLayer = new AVCaptureVideoPreviewLayer(captureSession);
            //previewLayer.VideoGravity = AVLayerVideoGravity.ResizeAspectFill;
            previewView.Layer.AddSublayer(previewLayer);

            previewView.TranslatesAutoresizingMaskIntoConstraints = false;
            var previewConstraints = new[]
            {
                previewView.LeftAnchor.ConstraintEqualTo(View.LeftAnchor),
                previewView.RightAnchor.ConstraintEqualTo(View.RightAnchor),
                previewView.TopAnchor.ConstraintEqualTo(View.TopAnchor),
                previewView.BottomAnchor.ConstraintEqualTo(View.BottomAnchor)
            };
            NSLayoutConstraint.ActivateConstraints(previewConstraints);

            topBlurView.TranslatesAutoresizingMaskIntoConstraints = false;
            bottomBlurView.TranslatesAutoresizingMaskIntoConstraints = false;
            var topBlurConstraints = new[]
            {
                topBlurView.LeftAnchor.ConstraintEqualTo(View.LeftAnchor),
                topBlurView.RightAnchor.ConstraintEqualTo(View.RightAnchor),
                topBlurView.TopAnchor.ConstraintEqualTo(View.TopAnchor),
                topBlurView.HeightAnchor.ConstraintEqualTo(150)
            };
            var bottomBlurConstraints = new[]
            {
                bottomBlurView.LeftAnchor.ConstraintEqualTo(View.LeftAnchor),
                bottomBlurView.RightAnchor.ConstraintEqualTo(View.RightAnchor),
                bottomBlurView.BottomAnchor.ConstraintEqualTo(View.BottomAnchor),
                bottomBlurView.HeightAnchor.ConstraintEqualTo(150)
            };
            NSLayoutConstraint.ActivateConstraints(topBlurConstraints);
            NSLayoutConstraint.ActivateConstraints(bottomBlurConstraints);
            topBlurView.BackgroundColor = UIColor.Orange;
            bottomBlurView.BackgroundColor = UIColor.Blue;

            previewView.BackgroundColor = UIColor.Red;
            View.SendSubviewToBack(previewView);

method.cs

// called 60 times per second (60fps)
    unsafe void DisplayBackground(CVPixelBuffer capturedImage)
    {
        capturedImage.Lock(CVPixelBufferLock.None);

        var baseAddress = capturedImage.BaseAddress;
        var format = capturedImage.PixelFormatType; //CV420YpCbCr8BiPlanarFullRange
        var width = (int)capturedImage.Width; //1280
        var height = (int)capturedImage.Height; //720

        cameraTexture.SetData(0, 0, 0, width, height, (void*)baseAddress);

        capturedImage.Unlock(CVPixelBufferLock.None);
        
        //Workaround #1:
        //CVPixelBufferRelease(capturedImage.Handle);
        //GC.SuppressFinalize(capturedImage);

        //Workaround #2:
        GC.Collect();
    }

    [DllImport("/System/Library/Frameworks/CoreVideo.framework/CoreVideo")]
    private static extern void CVPixelBufferRelease(IntPtr handle);