On a technical note: The luma sampling is actually fairly high with HDV, and if I'm not mistaken roughly 70% of the luma info is carried in the Y (green) channel, so in many ways greenscreen with HDV is like pulling a luma key--if it's lit properly and the green signal is well defined it should be farily easy to pull a quality key. It works even better if you convert your footage to a less compressed or lossless intermediate codec and process it from there. (Sheer, ProRes, CineForm etc.)
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