Support for real-time blur

[inkeliz]

I'm struggling to implement that feature, and I don't have any skill for GLES/OpenGL. But, if someone could achieve that, I think it will be nice to have support for the blur effect, like:

It can be useful for GUI, rather than a simple background. The blur must be "real-time", so any entity behind it (even moving) must be blurred.

I try to create some new Shader, just a modifier of basicShader, but I didn't get it to work.