Unfortunately the video has now been removed due to causing much embarrassment to the dash cam owner who posted it. So I will attempt to explain detail which is not as good as showing the video.
The incident involves the dashcam driver illegally cutting in front of a P plater causing him to slam brakes on to avoid his front passenger area being cleaned up. Footage from both the front and rear end cameras of the dashcam driver travelling along at 20 under the limit and a pissed off P plater right behind him. After a roundabout the P plater overtakes and then slows right down and gets out of his car to confront the dashcam driver telling him he needs to 'learn how to drive' and kick his front bumper then driving off.
Dashcam driver is confronted on the page from a majority of posters getting stuck into him for causing that incident. Some didn't condone the road rage but maintained that dashcam driver was at fault and some were glad that the P plater gave it to him.