How to show the UV distortion map on render target captured by the camera?

I am trying to use the lens distortion camera model and Draw UV displacement to render target function. I am able to see the different patterns on a plane or floor by setting camera parameters properly. I have also enabled the lens distortion plugin. But i want to see the distortion in camera captured scene(render target of the camera). I am setting the correct material and texture in Draw UV Displacement to render target function still not able to see any distortion effect on camera captured scene at runtime.