This is not your normal monitoring camera footage, the accident happened right behind a car fitted with a camera, so it's up close. There has been talk that the car was possibly a cause of the accident due to them trying to get footage of the truck tailgating them.
This happened in the Domain tunnel in Melbourne, which runs in the opposite direction to the Burnley tunnel where 3 people were killed in an accident & fire a month ago.
The root cause of the accident was that the car and truck were trying to change into the same lane, but the car was in the truck's blind spot. Very lucky that the car didn't fully rotate around the front and hit/get squashed against the tunnel wall.
Video:
https://youtube.com/watch?v=V1LM8TtSLZ0