Most people in Europe use their phones or normal cameras with camera stands, hooks, brackets, whatnot. No one needs to bring dash cams to America. People need to use their brains more. Then again there are a lot of dash cam users too. lol
Easiest and most common way is to get your phone in a gps stand, a lot of GPS apps offer a dashcam feature.
I think most dash cam footages are from russia. They need them incase accident to prove what really happened for insurance companies. Ill be getting myself some kind of dashcam and hooking it up on computer and seeing if i can stream some live action street racing or atleast just record. Only problem would be getting fast enough 4g upload speed. Well see Oh. Check the video from the annotation at the end "shots fired"