There is an Australian referree, Jarred Gillett, who is now officiating in Championship matches who I saw mic'd up for an Australian game last season.
He was brilliant! You might be able to catch it on YouTube.
As for dressing room cameras etc. it's a definitive no-no. The 12 mins or so the manager gets with his players at half time or whenever is crucial to team performance. I wouldn't want to see if myself. It is not for us to see. It's too much like public executions for me.