Hey. sorry, You won't can make your script with instant movecamera. If you do it, Will pass as with fadescreen comand.
The only form to make it is to use darken comand, but is very difficult (I don't know how make it).
Also you can use other methods. You can make a script (the green in advance map) and make a silent warp to black map. There, you can make the prologue and later make another silent warp to real map.
PD: If you want learning to make a instant movecamera, you can go to my tutorial (In tutorials zone).
Greetings!