Mood: The mood of the video appears to be nostalgic, romantic and melancholic. The theme seems to revolve around love, longing and possibly sacrifice, as hinted by the title 'Jab Tak Hai Jaan' which translates to 'As Long as I Live'. The use of the word 'Poem' suggests a poetic and emotional narrative.

Environment: The setting of the video seems to be a desert or arid region, with a vast expanse of sand and a cloudy blue sky in the background. The protagonist is dressed in a military uniform, suggesting that the video may be set in a military or war-like context.