Steen and Swen

Options > Controls > Battle camera section


Alternative solution:

C:\Users\<Username>\AppData\Roaming\The Creative Assembly\Shogun2\scripts\preferences.script.txt

If you want to change camera movement speed find line which says:

camera_move_speed 100; # camera_move_speed <float>, Set camera movement speed #
(change 100 to e.g. 150,200 or some other value, test out what fits you)

If you want to change camera turning speed then find line:

camera_turn_speed 5; # camera_turn_speed <float>, Set camera turn speed #
(change 5 to some greater value)


EDIT: Right, you said campaign camera. If camera settings aren't doing a thing then I think it's not possible to change campaign camera speed.
What you can do is left click on minimap(upper right corner) that will move your camera to selected part of a map. When you press LMB it will start moving camera like you would do. To speed up the process press Space bar.