What does the Windows Movie Plugin do?

so i’ve been browsing trough some of the things in unreal engine 4, and i came across the plugin “Windows Movie Plugin” tough i can’t find any documentation on what it actually does/add, can anyone tell me what i can do with this plugin/what it does?
if i posted this wrong feel free to move it to the correct part.

Also if anyone is bored and reading this and feeling like making a unreal engine 4 plugin, i’m looking for something that adds youtube support, so the tv mesh in realistic rendering can play video’s, just like the playX addon in gmod.

Anyways, thanks to anyone actually reading this.