And did you see the other link I provided, the one about courtroom rules of evidence?
Your wiki hearsay is really dealing with digital things like facebook pages, e-mails, blogs, twitter and such, not photos and video.
Now, this is a very simplified overview of a complicated matter, and it can vary from state to state or even court to court, but in general video evidence doesn't stand on its own -- somebody has to testify about who took it, what it recorded, etc. A cop might do that for you for a traffic violation -- but they probably won't. And even if they did, they're just testifying about what you told him.
Photographs or video recordings of evidence are important to your case. In order to be admissible, someone must testify that they reasonably represent the thing or person that was photographed or filmed. The person giving testimony concerning the item either must have taken it herself or been present when it was taken, so she can verify that the film or photograph accurately represents what it is purported to represent.