I have a Muvi; little jobber the size of a mini bic lighter attached to my handlebars. Just for Big Brother purposes. It is very small and unobtrusive, but you wouldn't use it for your fancy HD projects due to potato quality. Does what I need it to, plus I can forever cherish these random moments with humanity:
https://www.youtube.com/watch?v=sVA74cFKNmY