Hey Alex
You should look into cameras with IR Nightvision LEDs. They illuminate very well in complete darkness, and outside the spectrum of our eyes.
I know on eBay you can get cheap IP security cams with IR like
this but they might be too finicky to set up for what your trying to achieve.
Alternatively you can buy a HD webcam, and just add eBay IR lighting. (assuming the camera doesnt have an IR cut filter)