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Inside PDF? Eww.
I've never seen video embedded in a PDF, but based on what PDF files usually look like under the hood, I'd expect the video data to be in the form of a giant blob of base64-encoded data, in all likelihood, wrapped with some sort of magic commands to tell the reader that the blob contains video data. If you can find that blob, you can probably copy the base64-encoded blob to a text file, then use a base64-decoding tool to extract the raw video.
Of course, whether anything can then process the video file or not depends on whether they leave in the appropriate header data when they stick it in the PDF file or replace that data with equivalent data somewhere else in the PDF file (in which case you'd have to reconstruct the header bits). I couldn't begin to guess. It's worth a shot, though.
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