How Do あなた Make Tribute Videos?

I have seen pretty amazing tribute 動画 for TPoM on YouTube and I have been wanting to make them myself. The only problem is I don't know how to get the 動画 from the episodes and I also would like to know the best softwares (or whatever they are called) to make the 動画 on. If あなた could help then that would be great, thanks! :)