The fish eye lenses of most action cams really shine as a 2nd shot camera like looking back at the hunter. Put one on a turk decoy or near an often visited scrape and you have an awesome addition to your clip.
As a main cam the action cams makes everything look like the scene is filmed from afar. A 20yd shot of a buck looks like 45yd, you miss details. I have a shot of a buck at 12 yds it looks like 25.
My GPH went south and GoPro gave me a 20% discount towards a new one. So i opted for the new Hero4 Sessions. Havent used it yet but I operate it from my phone, which gives some options as a 2nd camera on my hunt.
If you search diligently you can find a used video camera for your hunting vids for around the cost of the new Heros.
Action cams have a place in hunting videos, but are much better suited for a 2nd cam. Having Said all that there are many more uses that make the Action cams fun and useful around the family!
http://www.bestbuy.com/site/sony-as20-hd-action-cam-black/8731073.p?id=1219362856664&skuId=8731073