Police Association president Scott Weber said the roll out of the cameras to every front-line officer was a "natural progression" following a successful trial of the technology in some police commands and moves by the state government to allow video evidence to be used in domestic violence court cases.

The GoPro-style cameras have been trialled by front-line officers in the Public Order and Riot Squad, parts of the Police Transport Command, the South-West Metro Regional Enforcement Squad and the Brisbane Waters Local Area Command.

Mr Weber said a further 252 cameras were being trialled by officers in metropolitan commands including the Eastern Beaches and Kings Cross. He believes the cameras will eventually be worn by every frontline officer.

"The officers think it's fantastic," he said. "What it does is change the behaviour of offenders and it's a very valuable tool for gaining evidence."

"We'd like all front-line officers to have the cameras so they can detect offences and put evidence before a court to highlight the nature of the incident.

"We see some horrific things and sometimes it's not enough to explain the emotion, the sheer violence and the magnitude of some offences we see unless there is footage and pictures and sound."

On Tuesday Police Minister Stuart Ayres said he was committed to the expansion of body-worn video.

"It has a series of positive benefits for police when it comes to changing behaviour, collecting evidence and training," he said.

Mr Ayres pledged $4 million in May to roll out body-worn cameras in more police commands over two years. However, legislation has not yet been introduced to allow a complete roll-out.

Fairfax Media reported on Tuesday that the NSW government has introduced a separate bill to allow police to enter domestic violence scenes with video cameras and use the footage and video statements as evidence in court.

Crime prevention campaigner Ken Marslew said the adoption of body-mounted cameras for all front-line officers would be an "all-round positive" for victims, police officers and the community.

"It would certainly give victims the support they need and often don't get," said Mr Marslew, founder of Enough is Enough.

Stephen Blanks, president of the NSW Council for Civil Liberties, supported the roll-out of cameras, saying it will keep police accountable too.

"These cameras are fine so long as police can't turn them off," he said. "If they are going to have them, it's important they capture everything that occurs, not just material selected by police."

Mr Weber said the footage could be submitted as evidence in the same way CCTV or dashboard footage is.

There has been a substantial reduction in complaints and court time following the roll-out of dashboard cameras in highway patrol vehicles, he said.

"The cameras more than pay for themselves, with police officers spending more time on the road and less time in court," he said.

The cameras are common in the US and Britain, and have been trialled in Victoria. NSW Police did not respond to requests for comment.