Get player to controll camera rotation in cinematic

Ok, so I have a level sequence, it’s played automatically at the beginning of the level. The sequence has a camera rail rig, with a cinecamera that is a BP and a train window mesh connected. The sequence works great, both camera and window follow the rail. I want that the player to be able to controll the camera to look at the scenery. The camera control will be limited but I know how to do that.

What I don’t know is how to get the player to control the camera during the level sequence. Please help.

Thank you.