I bought an android tv box which has xbmc,facebook & Skype calling.. when I plugged in an camera to the USB it does not detect any camera. It says can't find camera connected .
Welcome to Android Central! It could be that the TV box's firmware doesn't support USB cameras, or it could be an issue with the camera itself. If you plug the camera into another Android device (like your phone or a tablet), is it recognized, assuming you have the proper app for it?