This chipper, no-warts-and-all tour chronicle was shot last year when the pop star crisscrossed the world on her California Dreams Tour. Perry is likeable in her camera-friendliness, and she works hard. Maybe too hard. The film captures some of the kookiness that makes her a big star. When you see and hear so many fans of so many backgrounds expounding on what “Firework” means to them, you realize that while a song may or may not be for you, it most certainly is for others.