Try the CameraControl program here and automater scripts:http://www.osx86.net/view/1693-acer_cry ... ation.html
I've attached my automated launcher app for FaceTime per the write up on the above link. You can modify it to automate the other programs. They open CameraControl, then the app that it's launching, and then shuts down CameraControl after two seconds. You may have to extend the pause between opening and closing CameraControl if it doesn't work for you. Then you have web cam access in FaceTime, PhotoBooth, and Skype.