Is it possible to make your character Custom-Izable with different skin types and hair and stuff (Stuff i put in the game)
But it also be in a video
like in the video its not some random guy but actually the guy u customized if so how do i do this.
Real time rendering. Not pre-made videos.
It’s possible, but not easy.
I think you might be better off by not worrying about customizable characters, menus with integrated help systems, or the quality of cut scenes at this stage. Make a playable level/demo/fragment of your game first, and then tackle finer details like these.
Just my US$0.02 
A very basic way of doing this would be to stack 3 or 4 different hair types in one model, and then just ONLY enable the one thats currently active . I haven’t done this , but this would be the simplest way to do it .