Hi. I know a way using CamTwist with Syphon plugins.
CamTwist can output a virtual webcam that can be read by others apps, like skype or flash.
You can find the Syphon module here:
https://github.com/barrabinfc/camtwist-syphon
Or, alternatively, you can try to download the beta CamTwist, that already have Syphon support natively.
Let me know if it works for you.