Add SCBlurOverlayView show blurred images, 

Add UIPinchGestureRecognizer and UIPanGestureRecognizer control SCBlurOverlayView radius size and the location of the blur blur·

Question
1、I don't know how to according to SCBlurOverlayView blur the radius of
the size and the location of the blur blur picture
2、How to add the image filter?