This is advertising bait.
The OP story is total BS. If he was stopped for speeding and given a specific number, it was recorded evidentially. VASCAR or Speeder Follow. If that was the case then whatever his dashcam showed is largely meaningless. It's not calibrated, the time stamps are not proven and it's validity as evidence is questionable.
The conversation would have gone something like this:
Police - You've been stopped for speeding, going 75mph, here is the evidence.
Driver - But look at my dashcam!!!
Police - That's nice, see you in court.