How to redirect renderer's input to Virtual source filter's output in directshow !?

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C++

C#

DirectX

directshow

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I am trying to create directshow virtual source filter. Which is to deliver the video sample of what the renderer currently displays. Exactly like what e2evcam filters does. I tried using the sample of push source filter example from the sdk, its accessing the image from the particular location and send to the render to diaplay it as a video. I don't know how to proceed further with this. Can anyone help me to find the right path to do this.

Thanks in advance
J.Surjith Kumar