In Unreal, every project uses some default game mode, player controller, player pawn and camera manager, which handles input and camera stuff.
If you open editor - project settings, you will find default game mode under maps and modes section.
So, if you need some custom player/camera behavior, you need to create your own player character and set it in your game mode class.
In case your project is some movie, you can use different cameras with animations using Sequencer.