The invisible opening scene

This is the opening scene to the film " The Invisible" which starts with a panning shot over the ocean then into a forest with a city in the horizon  which then dissolves into a birds eye view pan over the forest, then another fade into some sort of party  in a rich modern building.  Then in the same shot you hear a speech for a boys birthday, and follow the boy as he gets a piece of cake, go downstairs to eat it, sit down, then into a close up shot of the boy getting a shotgun and aiming it to his face, then it is discovered it was a nightmare. The camera is constantly moving throughout the introduction an it consists of only four shots in total, and the music gives the impression hat the scene is meant to be sad in the shot where the main character walking around his party. The introduction is clearly meant to based on the character.