How did they do this?
 

If you look at the feed below its from an Indian movie "Delhi 6".
What they are trying to show ion this video is that the guy is from new york city, he goes back to India where he falls in love with this girl who is wearing the white dress in the video. If you guys notice the movie makers have combined sites and signs of Times Square (NYC) with shots from Delhi (India). I know that they used After effects (they probably keyed out certain areas of Times square and introduced streets and side walks of the city Delhi. But how did they do it????

YouTube - Dil Gira kahin per dafatan

You guys are the experts like i always say.

Thanks

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