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Theres things that vectors are good for, and things that vectors are bad for.
Recreating a semi realistic face with vectors usually ends up with a larger file than if you were to just use something like jpg compression on a photo.
Given that, movies using true vectors would often mean much, much larger file sizes, and in some regards defeat the purpose of moving to a vector based system - if the file for a true HD movie using normal compression is smaller than a vector movie, then why bother?
Having said all that, the use of vector information in modern video compression techniques is pretty important. Mpeg2 and Mpeg4 both use codecs that rely on a technique that can be likened to vectors. The systems break one frame of video up into multiple little squares, then look at the next frame and describe that frame based on how it looks compared to the previous one - ie: is the first block moving slowly right (as in a panning shot), or zooming in? The intermediate frame contains little 'video' information, but does contain information that can be likened to vectors - the mathematical information describing change.
This is probably as close to vector video as we'll see for photo realistic video any time soon.
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