Are Police reports used as evidence in criminal trials?
In general, documents are considered hearsay and are inadmissible. There are exceptions to the hearsay rule that allow them to be introduced, for example public records that are made in the normal course of business, but police reports are explicitly and specifically excluded from those exceptions. It might be possible to introduce a police report as evidence if the officer who wrote it is present to testify to its authenticity and accuracy, and to be cross-examined about its contents, but if the officer is there it's easier to avoid the hearsay question entirely by just having the officer testify.
Note that this applies not just to written police reports but also to bodycam footage. You still need someone to testify that the footage is authentic and accurate, and available to be cross-examined about it. With bodycam footage I suppose that could be either the officer or a technician responsible for collecting and archiving the footage.
In the case of an AI-generated summary of the footage, if the officer checked and edited the output I think it would be exactly the same as the officer's self-written report. If the officer didn't check and edit the output, then it would be a mechanical transformation of the bodycam footage and you'd need someone to testify to the accuracy of that transformation, as well as the authenticity of the footage. I don't think anyone could honestly testify that the transformation is guaranteed to be correct and accurate. In any case, though, the defense could always just review the footage to point out any inaccuracies in the summary. Most likely the summary would be ignored completely and the bodycam footage would be used directly, after appropriate testimony about its authenticity.