They might cut away after the initial shot, the way they do with [some] especially gruesome injuries. Perhaps go to a commercial or a replay? Or maybe the players and trainers would shield the person from camera view.
On the other hand: Just yesterday in one of the NFl games, the quarterback (Tom Savage, Houston Texans) was hit hard and then showed classic signs of a concussion: he stayed on the ground, his arms were up in a defensive posture and they were shaking. He was taken out and theoretically given the concussion protocol, but then shockingly he was put back in for several more plays before finally being pulled. His team/the NFL/the doc that allowed him back in the game should be ashamed, and they should be sued for criminal negligence. Not only were the signs of concussion obvious, but this same quarterback had suffered a concussion in his previous game. The team should have been extra-alert for any issues, and should have taken him out of the game immediately when he was so obviously concussed yesterday.
Even though the cameras showed the replay, it at least serves as evidence of the concussion and the team's response.