At present this is not supported. The mechanism that Vlog Central uses for embedding video in blog entries was designed with three goals in mind:
1) Works in existing blogs (such as Blogger, TypePad, Movable Type)
2) Easy to use for both the vlogger and the vlog viewer
3) Give vlog viewers a choice of playback formats
Unfortunately, a side effect of this implementation is that is not possible to directly link the video. Vlog Central will support direct linking to video content in the future, although some vloggers may choose to not allow this type of linking.