Give them your insurance information before the cops show up. Don't get angry, don't argue with them, do NOT tell them about the dashcam footage, just give them the insurance info and let them commit the felony of insurance fraud, and let your insurance's lawyers handle it.

This particular video is of a truck driver being backed into. The police HAVE to come for that. As a truck driver, our company policy in this situation would be to call 911 first, give them the insurance info, stay polite, don't argue or mention the dash cam, and give them our Safety department's number and tell them they will arrange a tow if they call before leaving the scene. We then call our Safety department and STAY on the phone with them during all our interactions with both the police and the other driver. Our Safety handles insurance claims and WILL have them towed, then add that to the fraud charges.