You can rotate the camera view horizontal, left and right in 360 degrees.
And you can rotate the camera view vertical, upp and down in 360 degrees.
But I think you can't rotate the camera in the horizontal plane as a roll, (as a aircraft).
If you want to roll the camera view you must roll the whole room.
But I'm not sure about the roll?
If I remember right, I think I have seen a camera roll in a sp mod, but I think it was a trick.
As DarkKilauea write use a invisible func_train follow path_corner as a the target for the camera.