I made a mount out of my otter box and a scope ring. We will see of it holds up.

Not bad. Only thing I'd worry about is the percussion having an effect on the electronics. Have you seen the ones that mount your phone behind the scope?

Cool! Tell us how it works!

There have been a few reviews on here, like this one:

iscope

Not sure how well it will work mounted out toward the end of the barrel. Two things that I would question is the quality level at the distance you are shooting and the effect of the muzzle blast. Can't wait to see the video though

Accuracy rules typically state that nothing touch the barrel during the shot. The zero you had might not be the zero you still have with the camera attached.

Hope it works for you, let us know. The distance of the shot (like txshntr mentioned) will probably be the biggest determining factor

Most shots are 30-50 yards. We shall see. I will check accuracy before hunting. I saw no difference between before mounting rails attached or flashlight.