Save the video to your computer then log in facebook go on your page and go into your picture albums. Then up in the top right corner you can click add video :) Hit browse find the movie in your pc and there you go!
Insert memory card from camera into computer, or connect camera to computer
Up at the top look for "Add Photo/Video" click on it.
Then click on Upload Photo/video
Click Browse and go find the video you're looking for
Click Open and it should upload