Tips for recording pen and paper
The old school way is stop-motion animation. You basically take snapshots of the paper at regularly timed intervals, where you remove you hand and take the snapshot, then compile a video from the stills. You can use interpolation to smooth out the framerate.

Another idea to remove your hand and pencil is to chroma-key your hand and drawing implement (green-screen). If you keep the hand and pencil away from the center of the frame, you might have some success with this, and touch up any problems with elements from earlier or later frames. Problems with this: reflectance of the mask color on the paper; cast shadows etc.

Lastly, and probably most difficult, is to use a secondary camera (such as a video camera with "night-mode") and an IR pass filter. Cover or disable the IR spotlight on the camera, and attach an IR LED (extracted from a tv remote etc) very close to the business end of the pencil. With the right setup, one might wind up with a dark video field with light area where the LED is shining. With some manipulation, and {magic}, you now have a mask of the pencil area.