Here's a strategy I tried to do but gave up on:

1. Stream cam's video over IP via gstreamer (many examples if you search)
2. On laptop create a "Virtual Camera" (a webcam identified by the laptop/pc) that captures this stream.
3. Use skype, gtalk etc... which would connect to your virtual camera and take the feed from there.

I was able to do the first, the second step is tricky...

Hope this helps.