Any idea how they did this? The skeletons look a bit 3D, maybe Poser? ( Does "Poser" do 3D Skeletons ? ) Looks easy enough in After Effects once you got the 3D skeletons...
I don't know much about Poser, but you can use any 3D package for this. You'll need to match the camera angle first. You don't really need to do a full 3D Matchmove here since it's only a few frames for each skeleton. Easiest way would be to render out the video frames you want to see the skeleton and bring those into your 3D software as a background. Match the camera angle as close as possible (again, for just a few quick frames like this it does not need to be 100% spot on) then animate the skeleton to match the fighter. Render that animation out and then go to town in After Effects with masking and color and opacity. Easy as a lion.