It would be pointless to watch, like in the media any documentary of him would completely ignore the evidence that was against him. People actually didn't know a quarter of the evidence that was used in trial because news outlets refused to mention them so in the end you'd get a bias documentary
The Martin/Zimmerman case is one of the biggest examples of news media irresponsibility that I have ever seen. They were not concerned about reporting the truth or the facts. They just wanted to make sure it was presented in a way that could play both sides of the argument against each other and sensationalize the holy fuck out of everything for the sake of ratings.