Common sense suggests they don't just have one camera pointed at half a door. They will have security cameras throughout the building. We know that because we see footage from all over the buildings randomly on broadcasts.
It's also common practice for the league to request all footage when they have a disciplinary hearing. Somebody the other day here posted something regarding the league making a "request" It's not a safety concern so we know Shanahan won't be involved. This is a hearing about conduct but they would still want all the footage. They won't just turn on a DVR to the CBC footage of the game. (although I also wouldn't be surprised by anything from these clowns.)