Head over to GTAS(you probably might be knowing it as you are making Vid) and download Daayne's Main SCM.
Really helpful to stunters and that Star-Camera is disabled in it.
Edit:In case you dont know its gtastunting.net/forums
Moved to appropriate Section.
Welcome to TGTAP.
Read the rules.
I think you will need to reinstall the game.And keep the back-up of original files before installing any MODS.
As most of them cant be uninstalled.