Create a stream to VLC using this : http://blog.pclewis.com/2010/02/stre...camera-to-vlc/

and then using Manycam (windows) to create a virtual webcam using a part of the screen (which is your VLC window)

The first part will work for Linux to but i don' t think there is manycam for Linux.

Not the best way, but it works

Trying this now... On Nokia N900, a script containing:
gst-launch v4l2camsrc device=/dev/video0 ! dsph264enc ! rtph264pay ! udpsink host=LaptopTargetIP port=5434
or
gst-launch v4l2camsrc device=/dev/video0 ! ffmpegcolorspace ! jpegenc ! multipartmux ! udpsink host=LaptopTargetIP port=5434

On laptop, installing v4l2loopback with module-assistant, to perform
sudo modprobe v4l2loopback
And then something like
gst-launch udpsrc ! decodebin ! v4l2sink device=/dev/video0
or
gst-launch udpsrc ! multipartdemux ! jpegdec ! decodebin ! v4l2sink device=/dev/video0

So far, problem is, libv4l2: error getting pixformat: Invalid argument

And dummy camera on laptop is black.

Thank you. Best wishes.
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Per aspera ad astra...