Oh, so you want to do a more complex thing. The bad news is, that you have to do the position calculations yourself. To move smoothly to a point you could do for instance the following thing in your update-Method:
SimpleVector pos = cam.getPosition();
SimpleVector delta = new SimpleVector(targetPos);
delta.sub(pos);
delta.scalarMul(deltaTime * 0.1f);
pos.add(delta);
cam.setPosition(pos);
This is pseudocode, so never tested or something like that. targetPos is a SimpleVector and the position the cam should move to. deltaTime is the time in senconds since last update. Here the cam should move slightly to targetPos becoming more and more slowly.