New body-worn cameras are changing the way family violence is being dealt with by the justice system in Tasmania.

The cameras are already giving courts a new insight into abusive relationships.

Police are hopeful they may soon also be used to record on-the-spot statements that will take the place of victims having to give evidence later in court.

Officers were called to almost 4,000 domestic violence incidents in Tasmania last year.

To press charges, victims must give a formal statement to police and if it gets to the stage of a court hearing, the victim will have to retell their story in a court that is open to the public and in front of their abuser.

Clinical psychologist Dr Tess Crawley said it is a hugely traumatic process for victims.

"We're not just talking about stating facts as if they are passionless, we're talking about reliving an experience," Dr Crawley said.

"And reliving it in front of the person that did it to them is magnifying the intensity of those memories, which are intensely traumatic, intensely frightening."

Acting Inspector Marco Ghedini is in charge of rolling out about 600 of the body-worn cameras to officers across the state.

He said the cameras have the ability allow the courts to see what was happening at a family violence incident.

"The introduction of body-worn technology provides the ability for police to capture raw emotions of victims at the time, to capture evidence of injuries," he said.

"But also to capture evidence from the scene itself and of family violence perpetrators when they are interacting with police."

Acting Inspector Michelle Plumpton, who heads the Safe Families Unit, said the videos still had to comply with the rules of evidence to be able to admitted in court.

But she said, if admitted, they had the ability to give the courts a true insight into what was happening at an family violence incident police were called to.

"The advantages for the court is … it's the best evidence, it's contemporaneous, it's a recording of what's happening at the time, it's a recording of the scene, it's a recording of engagements with victims and perpetrators," Inspector Plumpton said.

"So it gives the court the ability to see and be where the police officers were.

"Whether all of that recording is admissible or isn't admissible will be a matter for the court but it puts them in the place of what the police saw, felt and heard — so it gives them the ability to understand what occurred on the evening."

'Anything that makes it easier for victims is welcome'

The cameras are already in operation in Tasmania's metropolitan centres. ( ABC News: Margaret Burin )

Dr Crawley said even being able to use the video as a tool to corroborate the evidence of victims and give the courts a new insight into abusive relationships was a huge step forward.

She said victims had often been manipulated by their abusers to think they would not be believed or that abuse was "normal".

"I think that it will always be difficult for violence victims to give evidence in court, that it will always be challenging task but if there's more evidence that corroborates their story … then hopefully that develops a little bit more confidence, a little bit more courage that people are going to believe them because it's a fact, it's a documented fact," she said.

Dr Crawley said any moves that resulted in a victim not having to relive their trauma in front of their abuser should be supported.

"Anything that makes it easier for victims is welcome, absolutely anything," she said.

"We can't guarantee that these cameras will reduce the necessity for cross examinations but I do agree they surely will help in many situations."

The body-worn cameras have already been rolled out to police in Hobart and Launceston, Burnie and Devonport will follow soon before more regional areas.