I don't have a permanent camera mounted in the dyno room, but I've set up a tripod and taken videos in there before. One of the issues is always lighting. There's a computer screen above the engine that records RPM, HP, and Torque, and it's fun to watch that while the engine is running. But it never seems to show up on the videos, it's always just white because the camera focuses on the engine and surroundings, which are much darker. Also, the sound of the pumps in the dyno room, and the fan on the back wall, tend to mask the sound of the engine, at least until it gets up to speed. It would be nice if I could filter that out somehow.
Regardless, I will certainly be doing some videos of the engine with the heads installed.