Hi there.

My question is quite simple: is it possible to change the camera in a replay. like behind the car. (which u have in the normal drive)

yes thats possible.
when youre in-game, go to editor -> replay
then select the replay where you want the camera to be changed
click on it and then select "edit"
then youre in the MT menu and can change the camera to whatever you want

btw this could have been posted in the "trackbuilding and mediatracker" forum as well