Bhatt says that he was moved "to tears" as the actor faced the camera.
The 66-year-old shared a sneak peak of the shoot along with a photograph, in which Pooja is seen staring at the screen while Gulshan was seen enacting his character.
"CABARET: Day 2. Gulshan Devaiah faces the camera and moves us to tears," Bhatt tweeted on Friday.
The film also features Richa Chadha.