There are specialized video capture cards that have an on-board dedicated CPU to capture real-time video, compress it with the algorithm of your choice (usually MPEG) and store that captured data directly to disk. The solutions start cheap, such as the PC based "snappy" adapter, to the very expensive, (dedicated professional beta-max based decks).
Your best bet to find more information on this subject would be to browse the newsgroups under "alt.video.capture", or buy a subject matter related magazine. Most video related APIs are used to pull data and move data to either system memory or video memory on the card itself. I'm not sure if one exists for SCSI related interfaces. Perhaps Microsoft's Web site can help you. Look under "DIRECTX 8.0", for any references.
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