Use USB webcam instead of built in FaceTime webcam
You could give CamTwist a try. It lets you take video inputs and remap them to virtual video sources that most apps can access.


I’ve used it to remap a Firewire video camera connected to my laptop (via a Firewire to Thunderbolt connector) as my main video chat camera when doing a google hangout. It also let me overlay graphics into the camera video before sending it out to google.