To simply do movies, there's a little icon that looks like a little movie clip thing ( completely forgot the name of that thing ) and you can type in the box provided, change your character's position and choose the certain camera angle/movements you want. And depending on what map you're on, it pops up for the entire map no matter how far a certain character is.
As for doing a video for YouTube purposes, yes, you would need to download a screen recorder and a video editor if your computer doesn't provide one for you.
There's different softwares to choose from if you look it up and do some research. Pick one that is best for you and your computer system.
Hope this helped answer your question ^-^