Well, i am not a expert of script, but you can prove with the comands IF and ELSE.

For example, when you push the A key (IF), the camera follow behind the player, but if the A key isn't pushing (ELSE), the camera don't follow behind the player.

... IF (key_A == 1)
{
camera.pan =......;
camera.tilt =......;
}
ELSE
{
camera.pan =......;
camera.tilt =......;
}
...
Ok? Do you know how I can put a video in screen seems a bmap? And in the map?