It reveals the bits of background scenery that were inserted via VFX into the fight and other action sequences in the film. In fact, if you've seen Sultan, you're probably going to be astonished to find out just how much was chroma-keyed in later - buildings, crowds and other pieces of window dressing.
"I never ever thought there was VFX," writes one surprised viewer in the comments thread. That's probably going to be your thought.
Sultan, one of this year's biggest films, starred Salman, 50, as a down and out wrestler who reclaims his lost glory by switching to Mixed Martial Arts or MMA. Anushka Sharma co-stars as Sultan's wife Aarfa, a wrestler herself.
The film became controversial after Salman told reporters that filming the fight scenes made him feel "like a raped woman" - a comment for which he never apologized later despite demands from women's commissions.
Sultan, directed by Ali Abbas Zafar, released in July and made over Rs 500 crores worldwide.
Watch the Sultan VFX breakdown here: