Well you are going to need a camera and a projector (and possibly a screen). One thing that might work depending on your setup is to use a small "lipstick" camera and use a mount to attach it to your table. That way you have control over where it is aimed/focused. Output the camera to a projector and that's it.
What size audience will you be performing to? Larger theatres may already have a projector. You can probably find the camera pretty cheap, but the projector and screen are both going to be a little on the expensive side.