Mood: The mood of the video appears to be lively and vibrant, with a theme that seems to blend traditional Indian culture with modern elements. The presence of dancers and traditional performers suggests a celebratory atmosphere, while the couple in the center adds a romantic element. The overall theme seems to be a fusion of old and new, with a focus on entertainment.

Environment: The setting of the video appears to be a cultural or festival-like environment, possibly a traditional Indian celebration or a film set inspired by Indian culture. The presence of traditional dancers and performers suggests a location in India, possibly in or around Chennai, given the title 'Chennai Express'. The setting seems colorful and lively, with a focus on showcasing Indian traditions and culture.