I'd like to avoid depending on the devices on people's bodies for philosophical reasons, also testing it could be even harder. But I read some researchers had

I'd like to avoid depending on the devices on people's bodies for philosophical reasons, also testing it could be even harder. But I read some researchers had success to do pose estimation from a wifi router, I have just no idea how to replicate that myself. A sensing floor could work for this, but given the scale of the area this could be too expensive. I actually wanted to use cameras from above, infrared could be a good idea, I will check into it — thanks for your suggestions!