Either that or there is no Event? An event is what causes the trigger.. But I would be surprised if that was the problem..
Go to the Camera Palette and create a camera.. Right click on the Camera (where it is shown in the Palette) and click "Properties". Change the options like Field of View and Rotation and Distance and such to get a better view. The create the trigger "Camera - Apply Camera 1 over X seconds." If you chose 10 seconds, for example, it will move the camera from the current position over the chosen duration. The longer the set duration is the slower the camera will move. Fast movement is for exciting battle scenes or scenes involving very urgent situations. Slow movement is for sad, boring, and non-urgent scenes.
Also you do not need to have Cameras for Cinematics.. You just wont be able to view the cinematic from a good view, only the normal view.