Wow thanks, I didn’t expect such a complete answer.
I think I still don’t totally get the “PlayerCameraManager” class purpose because of a grammar detail : I’m looking for “several cameras” and the documentation says “the player camera” (like it’s the only one).
Anyways, your post helped me a lot ! I’m going to work on it and tell you if I encounter any annoying difficulty. Thanks ! 
And I don’t think I’ll be able to see your stream on Wednesday, but if you save the video, I’m looking forward to seeing it