Cam chat captures
Start in your Apple Address Book: Family & friends with, say, @or @are good candidates for Apple Messages, i Chat, @for Yahoo Messenger, @or @for MSN Messenger buddies.
Or try a video session with Face Book friends online.
One Apple compatible webcam effects and image adustment solution is a app called i Glasses from
It also provides alot of webcam effects to play with.
Frankly, Macs lacking USB 2.0 ports have hit obsolescence anyways.
Old USB 1.1 ports-devices will only show "Speed: 12Mb/sec" as thier maximum bandwidth. Modern USB 2.0 high-resolution UVC webcams utterly overwhelm USB 1.1 ports which are more than FOURTY TIMES SLOWER.
Some cams won't display anything - or if they do you'll find your Frame-Rate is so abysmally low you'll just end up in sluggish, slow-motion frustration.
Selecting which cam to use is done within the programs Video Settings...
similar to switching audio input sources between a built-in, external, or a Bluetooth headset. Trying to run Photo Booth, Skype or i Chat and perhaps another video app simultaneously - One app will put your webcam 'in use.' If And When you initiate a video call - the other app(s) can't share that.