The patent says "about 3 feet" instead of 3 feet, and while that's vague enough to be stupid they've helpfully provided images of their classes that represent a camera at that height in the post. Skimming that video it looks to be a very close match.

I'd be interested to know whether arguments used defending against prior art are legally binding afterward. For example if they said "nope, the camera looks to be 1m, not 3ft", would they be unable to consider something at 1m infringement forever?