तू ही हकीकत, ख्वाब तू

The poet compiles nice dualities to describe that sublime feeling, love. The male lover sings [in background]:

You are reality, [as well as] you are dream
You are the river, [as well as] you are the thirst
You are the [reason of] restlessness of my heart, [as well as] you are peace

... हैं गुज़ारिश ...

[Note. Notation for humming needs to be added.]
You have to see the movie to appreciate the context for the song, but suffice it to say that the lyricist, Prasoon Joshi, has deftly described the tumult in a man's heart as he awaits a 'yes' from his lover.
The meanings presented here are based on those provided by another blogger, The Bollywood Fan. (Netizens are welcome to comment on the meanings and, in fact, on the lyrics too). There are several music videos on YouTube, and one is here.
Another rendering by Soumen Nandi of Sa Re Ga Ma Pa 2009.
Google Hindi-to-English Translator translates गुज़ारिश as 'request'.