Kapur was spotted attending the screening of the film on Wednesday evening along with the movie's leading actors Shweta Tripathi, Vicky Kaushal and director Ghaywan.
"A new wave in Indian cinema is back forcefully with films like #masaan. Deeply heartfelt story and performances," the "Bandit Queen" director tweeted on Thursday morning.
The film follows a group of people living in Varanasi, which reserves a cruel punishment for those who play with moral traditions and bagged two awards at Cannes, including a debut director award for Ghaywan.