I’m not too sure where this comes from, but the video originated here on YouTube. It shows the original scripted ending with Aragorn at the Black Gate, fighting Sauron. This was in the original screenplay I received back in 1999-2000. It was conceived, story boarded, shot and edited and it almost made the final cut. However in the end Sauron was edited out and a CGI cave troll was added in. This was either done to keep in line with the books or for some other unknown reason. Take a look at what would have been!