Editor Dude (formerly known as Mr. Editor Guy), is a useful tool for making editing movies in Arma2. You can "teleport", run the game in "Slowmotion"
and even use Camera.sqs. All from the player action menu in-game.
When you use camera.sqs just use the bulldozer controls W,A,S,D to move the camera. Use Q and Z to move the camera up and down. On your keypad, use 8 and 2 to pan up and down. And finally use 4 and 6 to pan left and right.