Got it, so my initial understanding (I hope :D) was correct.
Having said that, you don't want to do this process live, right? (if so, what you want will definitely be doable, withing 1.5 months or so)
LATER EDIT: On another note, I'm curious how big of a use-case is this, 'cause if it's big enough, I could actually make a subset of my app which would do just this (allow you to cut which camera is the "active" one) - and I would give this for free.
LATER EDIT: On another note, I'm curious how big of a use-case is this, 'cause if it's big enough, I could actually make a subset of my app which would do just this (allow you to cut which camera is the "active" one) - and I would give this for free.