Yar Ko Parag is a traditional Armenian song. For more about the song, see Yar Ko Parag under Music.
When Haig Yazdjian released his version of the song, the Armenian dance instructor from Holland, Tineke van Geel, felt compelled to add some choreography. She did a great job. The first link shows glimpses of Lee Otterholt, the North American instructor most associated with the van Geel choreography, leading the dance.
I’ve included another link to someone else demonstrating the dance because its much clearer, but I think Otterholt’s is the more definitive version.