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I don't think you understand. iOS is screenshot-capable (power button + home button). There's your print screen button right there. You just connect it to a PC and you can simply transfer the pictures and work your OCR magic from there.
For books with video embedded (which are pretty rare, it's more of a gimmick really), there are TV tuners that can capture from HDMI. And I believe the iPad has video-out capabilities, am I right ?
If a TV tunner and a video-out cable is too expensive you can simply film the screen with a video camera. Sure, the quality won't be that great... It will probably take some filtering. But it CAN be done, make no mistake about it.
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