The nature of climbing moves means that there are normally a wall in the way. And you will have your back to the camera if using a depth sensor setup like kinnect. Lots of climbing moves involves fairly complicated hand movement in between the wall and you. So occlusion will be a big issue. I managed to get a partial success out of 6 cameras positioned one behind, two on each side at different heights and one above pointing straight down. Still this takes quite a lot of work to setup on top of the route setting and booking of a climbing wall. If someone told me that PN could deliver reasonable results with both feet off ground, i would maybe try invest in it and do some experimentation with it.