I mounted one of these (or one similar) to a youth hockey goalie helmet. I used two-sided tape and additional electrical tape. I found that the angle can make or break the whole video, so make sure to test out various ones. Second, these are pretty tough, the camera took quite a rigourous shaking, various temperatures and still works well. I was not happy with the resolution (as mentioned above) but I only paid around $20 so I am sure it is not a HD model.
Last item, the goalie moved his head soooo much that I almost get sick watching