Instructions
Verify that your webcam is UVC capable. You can look in the manual or check the manufacturer's website.
Plug the webcam USB cable into one of the USB ports on the PS3.
Turn the console on without a game loaded in the tray. The dashboard will load automatically.
Scroll to the "Settings" icon, then scroll down to "Accessory Settings."
Select "Camera Settings" to verify that the PS3 is detecting your webcam.