(disclaimer english is not my native language)
So pretty much everyone these days uses a smartphone, cameras getting really sharp and are not low quality. Why are people dependent on a USB webcam? If adobe's client is working from his laptop does he really need to get a second camera? Let's say you are recording head movements from a different person and voice, you pretty much have to either buy a new webcam or just try to squeeze on one laptop. I could see people just use phones to record certain character movements.
I don't know if there will be any problems with motion tracking, nor if it is possible. But companies like whatsapp use a QR code system over wifi which just works.
best regards ralph