How to optimize HD video recorded from camera?

*compress not optimize.
My friend has a .........
He recorded 4 minutes of HD video and it is 2gigs.
He wants to have HD videos on his site, but obviously doesn't want people to download videos of 2gigs for 4 minutes.
Since there are full HD movies that are 8gigs, I thought this would be a good place to ask how to optimize it without losing much quality.

this place probably can help: http://forum.doom9.org/