using usb webcam with facetime

I have a generic USB Webcam 720p connected to a USB port on my Mac Mini (2012 version) running 10.8.2. Tried using webcam on facetime, my HD monitor doesn't have webcam, for the first time. When opening FT the image from webcam displayed in the window, but when FT started connecting window went brown and hung up after a minute or 2. There were no drivers for Mac OS, but listed Mac OS X 10.5 or higher, with plug & play.

Any suggestions I would appreciate it.