There are many films with same name Chingaari or Jingaari. This word means a spark or flame depending on the context. The movie which is linked in the question is a Kannada movie. It is different from the movie Karl Pilkington and Warwick Davis acted. The film they acted is Chingari(2012) a bhojpuri film. Warwick Davis acted as a journalist in this movie. This is a low budget movie.
Here is the clip in the trailer where Karl Pilkington and Warwick Davis are shown. Warwick Davis says the dialogue :
This is jungleraaj(Rule of Goons).
Warwick Davis and Karl Pilkington are seen complaining about the crime they witnessed at a police station and are not happy with the police's reaction to the complaint.
By watching the movie trailer, it is clear that the movie is set in a state where Goons are not bound by the law. The protagonist of the movie is a female. The Villain in the movie is a goon who is also the brother of member of Legislative assembly. Due to political support, even the cops are afraid to take action on his crimes. He somehow messes with the protagonist of the movie and her husband gets killed by villain's men. She finally gets courage to revolt on this issue and kills the villain. This movie potrays the condition of crime in the society and the status of women.
This website says that the movie released on October 12, 2012 but the Wikipedia page of the protagonist and other websites doesn't show any details of the movie being released. The former website is the only website to say that the movie is released.