It's from the 2012 documentary "Doin' It Again" (amazon) showing live performances, interviews, and recording sessions. The specific video I linked in the original post is from the Good Vibrations recording sessions part of the documentary.
Here are the chords: https://www.guitaa.com/chords/kannana-kanne-viswasam-song-cover-version-by-my-daughter-varsha-renjith-and-me