Good choice on the 3+, GoPro 3 had too many issues needing fixing after buying. Here is a post I put in the Colorado forum.
TG
I have done quite a bit of filming and here are my tips.
1. I agree the above regarding the narrow the Field of view (FOV). Depending on which GoPro, you may be limited. I have Hero2 and the narrow FOV is only an option at 1080-30 so you can't do slow motion well. Don't know the FOV options on Hero3.
2. The quality of the video on Hero2 is greatly limited by decreased sunlight. If you notice on the GoPro website their vids are always middle of the day. Their vids turned out so good because they have several cameras and likely Many, Many repeat performances to get the quality they want. The Hero3 is supposed to be improved in low light conditions.
3. There are several ways to mount, gun, chest, dog, head. Head has the best view by far. Gun mount sound great but if you want to video others they will get a littler upset if you point your gun at them to film. Chest mount is obscured by the gun and Non-dominant elbow. Dog views, you need a lot of vid to get very few seconds of usable clips because of the shaking while they run. Head mounts give the best view but You have to train yourself to look around with your eyes not your head. You also have to learn to walk softly to avoid bounce. When a dog is on point, you won't remember. I have been thinking about belt mounts which may work well but is limited by the depth of the vegetation.
4. When the weather is cold or wet, keep looking at the lens on the cover. You never know when it gets frozen over or fogged.
5. Quail hunting with the GoPro will almost never turn out satisfactory because of the size of the bird and the backdrop. It is always difficult to see a bird with trees in the background. Pheasant on the prairie is the best situation for filming. Large birds, Usually sky in the backdrop as they launch up.
6. When uploading to Youtube, there is considerable resolution lost despite uploading in 1080p.
Below is my vid that I put up after my North Dakota trip. You can see the image issues in low light, fogging/freezing lens, fog in case. Just note The still pictures were taken with a Canon SLR so the quality is outstanding. When walking in the "field of gold" look at the little blips off the tip of my shotgun barrel, those are birds at the far end of the field. In the original vid they are clear as day, uploaded you can barely see them.
To give an example of the quality difference of video taken between Point shoot camera video mode and GoPro, The short clip where you hear "ROOSTER", that was shot with a Canon P&S.
https://www.youtube.com/watch?v=I4flIs-TJps