Vinod Kapri is a film-maker who travelled with seven migrant labourers from Ghaziabad to Saharsa, Bihar for seven days and seven nights. The former journalist is also the writer and director of award-winning 2018 film Pihu. He spoke to Outlook about the arduous journey of the migrants, the highs and lows of it, and what gave him the impulse to pursue their story. Here are the edited excerpts.