Kick-Ass is a 2010 British-American superhero, action, comedy film based on the comic book and is the prequel to the 2013 film Kick-Ass 2. (The clip above is only part of the opening)
In the beginning of Kick-Ass recording of people talking of superhero's play and then heroic music starts which is appealing to the audience as it implies that the film will be about superhero's, danger and action. As the credits appeared on screen a 'whoosh' of air is heard then the recording of people speaking stops. The music played in the opening sequence links with the theme of the film, but is it conventional or not? In the film's world it's a mixture of both, showing how unconventional it is for superhero's to be real but conventional as they don't need 'superpowers' and that anyone with drive to help society can be a superhero- not necessarily a good one but a superhero never the less.

As tension is built by the non diegetic music there is a voice over of the main character, speaking in a narrative point of view which is non-diegetic. The music continues and builds up more tension as it gets slightly louder with a crowd clapping and a 'whoosh' of wind louder then the clapping. The music is cut quickly as suddenly a crashing sound is heard following by the crowd mumbling slightly as the 'superhero' has fallen to his death, with a scrambled sound of recorded music after showing the change back to reality. The music being  fuzzy sets the audience up, ready for the film to begin its as if its been recorded on a phone implying it was someone wanting to be a superhero recording and playing it which fits in with the film and the narrative perception of the main character continues but is louder.