Could anyone help me find the bass notes/chords for this song? Im trying to learn the song, but I cant find any sheets. Im an amateur pianist (9 months experience) and my musical hearing isnt so good yet. The melody seems easier for me to figure out than the lower notes though. I also figured (I think) its played in the A major scale.

Anything would help!

Link: https://www.youtube.com/watch?v=mrWSjyo7I4w