Camera not working after damage liquid.

You most likely have corrosion around that area on the logic board. Before using it anymore I would suggest to get it professionally cleaned. I'm not talking about fans and dust/dirt but a board level logic board cleaning. I do them myself with in isopropyl bath and some gentle but very CAREFUL scrubbing with a small brush. Sometimes liquid can leave behind a residue that will slowly damage your computer over time. It may work fine at first and then slowly things stop working. Most of the time, a cleaning will rid most, if not all of the problems you are having on a water damaged machine, and help prevent future problems from arising. I would try to get the board cleaned which would, if board corrosion is causing the issue, fix the camera. I have repaired a decent amount of water damaged MacBook Pros and they are not easy for a first time machine. I would try to bring it into a local store that handles this kind of thing. If it was only a small spill and you haven't used the computer for a long time since the spill then you will most likely get rid of all problems.

Hope This Helps