Earlier quoted context omitted.
The trouble with any such footage is that it can be used against you ("as the the defendant's own records show, they were present in the murder area") but they generally won't extricate you when produced by you, since you clearly have a motivation to use it selectively. So you showing a picture of yourself reading a book during what you claim is the murder night is not an alibi, because it could have been produced at…
I‘d be interested in knowing of any cases where someone who recorded their own activities used it as an alibi. Right now it's all theoretical. Dash cams are really strong evidence in traffic court, but this isn’t criminal so it has a lower bar. From the other end, body cam footage is powerful when worn by police, and cell phone evidence by bystanders are also strong evidence.
I served on a jury where a case was built around camera evidence immediately before and after an event. Of about a dozen relevant data sources, only one had verifiable, correct time. The defense was able to impeach that evidence, and the whole case collapsed. A dude got away with manslaughter.