How to get Gaussian blur effect on UIView in iOS6

Question

Does anyone know how to achieve a Gaussian blur effect on a UIView in iOS6? Like #music twitter when the filter menu is open. (the background under the menu becomes blurry)

Answer 1

I wrote a GPUImage -based RWBlurPopover library that can achieve a similar Gaussian blur effect when popover is presented. It supports both iPhone and iPad, and works on iOS 5.1+.