Go Pro does make a view finder, and it works great. They aren't the best cameras for filming hunts, but they do make cool POV shots and video, I have one mounted to my bow and it works great, I use the heck out them during fishing season too.
I used to carry a video camera with me everywhere I went, I still try to always have one in my truck but don't back it with me as much anymore while actually in the woods, I just never get around to getting the camera out and filming especially if I am hunting so I ditched it to save weight.