webcam support for a WM8850 7" netbook???

[BrianP2013]

hi all, new member Q please...
-just bought a netbook that uses a wm8850 processor and jellybean 4.1
it has a built in webcam but I would like to connect a usb webcam.

-can you help with how to get the netbook to recognise an alternative/usb webcam?

the netbook has two usb ports and 'sees' a usb mouse but not a webcam.

-any ideas please?
would software sort it or a specific webcam?

thanks for any help!