Facetime works with USB UVC gearhead webcam but nothing else does

I have a gearhead USB 2.0 webcam that facetime easily see but nothing else does
It is a model WC4750AFB from gearhead it uses USB 2.0 Connectivity with UVC and Facetime sees it but I can not get any other applications to use it
Why can one app on my mac mini find and use it suxxesfully and others can't. This is really stupid. There is no basic instruction onhow to setup facetime or find out how it can see the webcam and it would be nice to know so I can get it working with my other app on my MAC mini

Logitech - HD Webcam C615
http://www.bestbuy.com/site/logitech-hd-webcam-c615/2588445.p?id=1218337862339&s kuId=2588445
Logitech - C920 Pro Webcam
http://www.bestbuy.com/site/logitech-c920-pro-webcam/4612476.p?id=1218501788204& skuId=4612476
I know FOR A FACT that those two WILL WORK with Mt. Lion and ALL Mac Apps that use a cam.
Skype too.
I really like the 920. It shoots in 1080p HD. EXCELLENT picture quality and video quality.

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