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Good idea. I think this one is somewhat widely used, but probably because it's a great example of hard backchecking. One I've used a lot. Credit to Weisstechhockey.com for the commentary

I've struggled to get that technology on the ice. Always preferred a white board as it's larger and you can just draw and adapt as the team needs in the moment. I do like these products for planning and distributing in advance so players can come prepared. CoachThem looks like another interesting one, although I haven't used it.

If you're trying to get live/real-time video feedback, it sounds like the Gopro option is a good one. As for video analysis/services, we've been using Krossover. Unlimited storage and good telestration tools. Their paid breakdown service is pretty good and not too expensive. www.krossover.com