Behind India's Oscar entry film Koozhangal or Pebbles is a group of passionate ordinary young friends largely from Tamil Nadu. Directed by Vinoth Raj, it's a story of a father and son trying to bring back the mother who left home following domestic violence. Presented by Director Vignesh Sivan and actor Nayantara, Koozhangal has already won the tiger award in Rotterdam. NDTV's Sam Daniel caught up with the humble team on their hard work, passion, planning, struggles and the USP of the film.