metal (like chrome) composited over live action

so. i have been trying to fuigur this out for a while now, and been all over the net… so i gave up for a while took a rest… but now im back at it. so i am trying to fuigur out how to make an object in blender and make it look like it is chrome and it fits into a live actions scene (reflections match and stuff). so lets just simply say i have a chrome ball, and this ball is in the middle of a room everything is video, except the chrom ball-which is in blender. how do i get the chrome ball to reflect hte room so it looks reall? any help on this? -thanks

Scroll down a little, it’s been done in the tests.