A still from the video shows security guard Lance Wharewaka with the skateboard.
A video showing a spat between a security guard and a skater in which the guard furiously snaps the board in two has gone viral on YouTube.
The Eden Park guard told a group of skaters they were trespassing before smashing the board against a gate and throwing it into the street, the video shows.
The video of the confrontation has been watched on YouTube more than 10,000 times in a day.
The skateboarders - a university student who wanted to be known only as Jerome, Joel Charlesworth, Ethan O'Shea and Jan Tee - said they went to Eden Park on Saturday and found the gate open, so went inside.