These videos are designed for guitar beginners or those with only limited guitar knowledge. They use simple chord shapes as much as possible and do not necessarily represent the way in which the song was originally played. They are designed as practice tools to supplement your other learning methods. Information is provided on screen for both right and left-handed players!
This is a very simple song for the most part, but the F#m is always an annoying chord for those that haven't quite got the hang of barre chords yet. The slow pace of this song means it's an excellent piece to use to practice it.
If you would really prefer to play it using only simple chords, then stick a capo on fret 2 and play the song this way:
E becomes D
F#m becomes Em
A becomes G
B7 becomes A7
Amaj7 becomes Gmaj7