Brandon, the following is an example:
The camera is moving with a vehicle and, at the same time, the camera is targeting another vehicle to the left of the camera's vehicle. Then you want the camera to target a differet vehicle to the right of the camera's vehicle, of course, while the camera's vehicle keep moving.
So, you need to setpos the camera continuously in camera's vehicle position and commit this change really quick. This commit is continuous and will commit not only changes in camera's position, but also anyother camera factor you change, for example, the camera's target (to look at another vehicle).
Blanco, there is a way with a moving gamelogic, but certainly not the "desired" way. The camera targets a gamelogic, and then you move (displace) smoothly that gamelogic from one vehicle to another. But then the displacement speed should be accurate enough to provide a pretty smooth angular displacement (from the point of view of the moving vehicle) to avoid camera "jumps". And the displacement should be 3D, not only 2D, your next target may be a flying chopper, then a burning tank, then an incomming missile and so on.