I watched this video:
and loved the colors too much. I want to know how can I achieve colors like that in photo or video? Does 600D have that built it or is it a part of Photoshop / Lightroom?
It looks like those colours have been achieved using a kind of cross-processing. However if you look at the video description you'll see that the video has been processed with Adobe Premiere and Adobe After Effects CS5. The Canon 600D doesn't have that kind of processing built in.