The video is not for demonstration (I am 66 years old) but just for persuading Youngers to learn Harmonica and a few guitar chords to accompany it.
Most of the 40 melodies are Greek Music and are played using 4 harmonica keys (Am – Bm – Cm – Dm) so as knowing ONLY Am guitar chords and using a capo to be able to play any of melodies.
You will find links for all photos, repertoire, mp3 of the video and more information at the Youtube description.