cameras can also be used to measure the body and movement (for instance gait) of the criminal, which is actually useful for an investigator
For a theoretical investigator. Police departments don't have the money, manpower, or time to do gait analysis on a burglary suspect. And outside of China, is that even considered evidence in a real court of law?
Yes. This is absolutely done when assessing and comparing security footage. Burglars are often serial burglars (it's their job or hobby to steal stuff), and many of them show up on camera multiple times from different angles.
Crime goes by some skewed power law distributions and a relatively small number of people do most of the crime in any given area.
As an aside, security camera footage of a crime in your house is also great for your criminal defense (if you are going to use violence against the intruder) and for pressing a claim to an insurance company. If the intruder pulls a gun on you and you shoot him in response on camera, you can use that piece of evidence to get charges dropped against you or to prevent the police from even recommending charges in the first place.
For a theoretical investigator. Police departments don't have the money, manpower, or time to do gait analysis on a burglary suspect. And outside of China, is that even considered evidence in a real court of law?