A young man who filmed his friend being allegedly unlawfully assaulted by a police officer was told that deleting the footage from his phone would make things "a lot easier", a trial has heard.

Stuart Laird was 17 when he filmed the interaction between Kyan Foster and police officer Simon Mareangareu about 2am on Christmas Day 2014 on a Vermont footpath.

In the footage – which has been shown to a County Court jury and was released by the court on Friday – Mr Mareangareu appears to strike Mr Foster, who was 16 at the time.

The recording also shows another officer, Dennis Gundrill, tell Mr Laird: "Get rid of that video right now." Mr Laird later calls out in pain during what he now says was Mr Gundrill holding his wrist.

