I had to do this for my webcam on my desktop PC at home. I have a Microsoft VX-3000 webcam and it doesn't work with Linux. This is what I did:
Search on Internet for relevant search terms such as "ubuntu webcam microsoft vx 3000". I found this website: http://mxhaard.free.fr/ from Michel Xhaard, who is programming webcam drivers for Linux. I downloaded the driver and followed the instructions, which included compiling the sources and installing it as a kernel module.
After that, I can see an image from the webcam but the colors are all wrong and it doesn't look good... I didn't yet bother to fix that problem.
I interview a lot of candidates, and in every interview I try to get to a point where the candidate does not know the answer to some question. I then specifically state that "I am not worried that you don't know that - nobody knows everything - but I am curious how you will move forward and solve my problem". Most get the Google answer. Some tell me they will look up the answer in a book, and some tell me they don't know. I think only 1 person has said that since I obviously know the answer then they would ask me what it is (which I think is just about a perfect answer).
Most of the better interviews I know of are not really designed to find out what you know. It is (IMHO) far more important to find out how you think and how you can expand your knowledge.