That's what I was saying, beyond not wanting to break a bunch of cameras, it can't affect the safety of the player. If they could make a camera about the size of a pen or even a large sharpie and then embed that in a helmet on the side of the head next to the eye and above the ear, then it would be feasible since that shouldn't affect the helmet's ability to protect the player and it would still provide a vantage point that is nearly identical to that of the player himself.
The NHL could generate decent revenue from something like that if they provide a helmet for 1-2 star players on each team and then have the vantage point only be able to be seen if you pay for NHL Gamecenter or Center Ice and maybe for the nationally televised games on NBC and NBCSN, which would work well as a way to show off/advertise the feature for NHL Gamecenter.
I think the novelty would wear off quick when people start getting nauseous watching a game from that vantage point. It's one thing for little skills and shots in a clip like this and another for full fast paced game action. Players also wouldn't want to carry a camera back with them into a locker room or have one on the bench during tactical timeouts.