I want to capture a webcam feed using my camera. For that I am using the 2 references: AForge.Video.dll and AForge.Video.DirectShow.dll.
AForge.Video.dll
AForge.Video.DirectShow.dll
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If you want to support Silverlight, be it for web or standalone or WP7, you shouldn't start with WPF, as many features from WPF are lacking in Silverlight.
Here is a Silverlight 4+ tutorial:
http://www.silverlightshow.net/items/Capturing-the-Webcam-in-Silverlight-4.aspx