It sounds like you're talking about my 14 year old brother! lol He loves his television and movies but it's easy to get him away if you have music. Dance and sing with him. Get him up and active. I can almost guarantee that if you act silly he will love it and get involved too. That's what I do with my brother. He is just like any other teenage boy. He gets an attitude sometimes but if you just have patience he will eventually get tired of you messing with him and do what you want.
We love to dance and listen to music so maybe you could try this. You can even incoorperate kicking, standing on one foot, jumping, etc. to make it sort of like occupational therapy
Good luck! and have fun!!