This is supposed to be a video where Pelosi is loudly booed as she refers to the NSA leaker and defends the spying. But it looks like Youtube deleted the user account.
[Update] The first video below includes the original heckling as well as the loud boos when Pelosi refers to the NSA leaker and defends the spying. The second video is short, 41 seconds, comes after the heckling and just covers the loud booing.
Video below, the heckling starts at the 47 minute 40 second mark. Scroll bar can be moved to that point for those that don't want to listen to the whole thing.