I didn't expect to get so much commentary on this one, thanks everyone for posting, it's been interesting to read. I disagree with some of your perspectives but that's the beauty of free speech.
In the original video, I see the kind of driving that has caused collisions in the past. I recently dealt with a similar case of road rage that put a young girl's SUV into a ditch when she lost control as a result of a brake check. Partly road rage, partly driver inexperience, but that's the reality of our highways. We have new/old/experienced/unskilled drivers and our highway system has to be accessible to everyone.
Based on the video, I would like to contact the registered owner of the van and ask some questions. These questions would be under caution, meaning that the owner would be warned ahead of time that any statements he makes are ON the record and could be used in court. (for you conspiracy theorists, write this down) If you are giving a statement that is NOT cautioned, the police will have a very hard time using that statement against you in court.
I would never claim that my opinion is more important or more right than someone else's, but in this case it may be more informed.
Question for you: How is dashcam footage different than footage from CCTV downtown, or footage from a bank during a robbery? If police have knowledge of the recording, they can seek a warrant to obtain it (depending on the specific circumstances). With regard to dashcams, what I'm suggesting is that if you have seen something dangerous and recorded it, I am willing to review it. I am interested in bike-specific footage, only because that's where my interest lies.
I am not interested in suckering anyone in to give me video that incriminates them, again, that's not why I joined the forum. I fully realize that because of my chosen occupation, I will never be on some of your Christmas card lists, and I'm okay with that.