Lately, the safety inspectors have looked carefully at the mounting methods used for on-board video cameras. They will want to make sure that the camera won't fly off during a run. (This causes the whole track to shut down while they search for the missing camera. Major pain in the butt.) At some events, they put an approval sticker on it if it is attached securely. You need a sticker on every camera, or they will make you take it off in the staging lane.
So before you buy a camera, you need to figure a way to mount it securely, like with a nut and bolt through the base. They won't go for the standard sticky tape method. Maybe a lanyard will work, but check first.
If you don't have video, it never happened.