It's literally the entire video.
The story Brian Blessed tells is that George didn't know what he wanted, didn't give him any direction. He gave him lines in standard English with no dialect, and everything that came from the Jar-Jar species is just a spinoff of Brian Blessed's improvised performance. Brian explains that later when he heard the Jar Jar voice, he thought the performer didn't imitate Mr. Blessed's own performance well enough.
What I got out of it:
George thought he was letting a master of the craft help shape his prequel films by getting input and performances early in the process. He realized he'd gone too far, but only after screening the finished film in Skywalker Ranch (which can be seen in SW: The Beginning and is referenced in the RLM reviews). It was too late to go back and fix. Gungans are such a huge part of the film, and George Lucas is such a notorious control freak, that I am actually shocked he allowed so much of the film to form outside of his own head. It paints a very different story than I had envisioned around the making of the prequels.
Edit (2 days later) : Wow, I really thought others might be more interested in talking about this, one way or another. Whatev-skees.