I'm making a smash bros type game and I was wondering how to work the camera walls?

I can't find my question anywhere. I need a script where, like in smash bros and multiversus, when you hold on the wall, you start sliding down but you can easily jump and climb the wall. If one of you guys have the script for my issue please let me know. I also have a question about the camera. Whenever a character gets out of frame, the camera zooms out to fit all the players. I was wondering if I can replicate that and if you guys would know how.