There are abotu a million ways. But what do you mean point left?

camera.pan = 270; //points left i think
camera.pan = 90; // points right I think
camera.pan = 0;//points foward I think
camera.pan = 180;//points backwards I think

The other way may mean to slowly rotate it
while(camera.pan < 270)
{
camera.pan += 3 * time_step;
wait(1);
}//ater these numbers and wether to add or subtract as needed.