Click http://www.mikesmusicroom.co.uk/chordbook.html to download the complete keyboard chord book which includes 12 major chords, 12 minor chords, 12 seventh chords and 12 minor seventh chords.
The three major chords in this video are:
C Major
G Major
D Major
Second hand electronic keyboard for sale at:
http://musical-instruments-uk.mikesmusicroom.co.uk/Keyboard-Piano/Electronic-Keyboards