I'm Indian, I can shed some light on this!! The 'taka taka doom' is used when keeping time for dance, like Bharatanatyam or Kathak (I highly encourage you to search up some videos, the dance is pretty!) So what they're rapping/beatboxing is a fast Bharatanatyam rhythm. Teachers will say what they say while teaching their student how to dance, and sometimes the taka doom becomes part of the song accompanying the dance too! As for the green lady, she's singing Hindi nonsense words. It's close enough to sound like Hindi but it means nothing
Its actually south indian rythmic solfege. It's solfage, (like do re mi) but for rythm. It's used to teach people of all ages about rythm in music. So you see syllables like ta, ka, di, mi, gi, na, tom in an order to make a beat.
Well in Spotify "Jeevan" lyrics you all can see they are really saying "Ji bi sa attak adum" and "Ju attakacta" a lot of times. I don't know what it means but the mistery is solved ig.
Does this message appear by chance on RU-vid subtitles? Since they say anything but what the videos really say, I think more once I saw a video where nobody spoke but subtitles came out saying any lesera like poop or beer or ok.