Click http://www.mikesmusicroom.co.uk/chordbook.html to learn how to play minor chords and download the complete keyboard chordbook which includes 12 major chords, 12 minor chords, 12 seventh chords and 12 minor seventh chords.
The three keyboard chords in this video are:
Cm Chord
Gm Chord
Dm Chord
Keyboards For Beginners:
http://musical-instruments-uk.mikesmusicroom.co.uk/Keyboard-Piano/Electronic-Keyboards