While streaming availability can change, you can currently find the movie on these major platforms in India:
When Thorin refuses diplomacy, battle lines are drawn. But just as the Elves, Men, and Dwarves are about to tear each other apart, a fifth, shadowy army emerges: of Gundabad, led by Azog the Defiler (and his master, the Necromancer/Sauron). The epic war that follows decides the fate of the North for generations.