How to make control to the second player in a 2.5D two-player platformer

Hi all, how to make a second player control in a 2.5D two player platformer? The game is on 2 gamepads.

And how to merge the camera? Right now each character has their own camera. Thanks!

Attaching video: https://youtu.be/Efb0VA7nD6s?si=VPpYqtz8V6t-o-2x