There are plenty of USB video capture devices like GameBridge but, even if it's possible with USB OTG, you'll still need drivers and applications that likely don't exist. Perhaps something that streams it live over the network or Bluetooth? Mod a Looxcie with a composite input.
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Sony Ericsson Xperia PLAY 4G (R800at) Xperia PLAY (R800x) with Sony Ericsson MBW-150 Bluetooth wristwatch, Parrot SK4000 motorcycle helmet Bluetooth kit, and Looxcie 2 LX2 wearable Bluetooth camera/headset.
HP TouchPad 32GB running Cyanogen Mod 9.