So you wanna see everything twice

A live view of the tilt bob would be about the only interesting thing I can think of.

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What if you had an upper playfield that covered a big portion of the playfield, but there's a 2nd playfield area underneath that normally wouldn't be seen, but there's a wide angle camera mounted in there and you have to play using the camera.

Heck, why limit to a tiny portion? Have a completely second playfield in the bottom of the cabinet with a camera mounted at the ball trough. No longer are you limited by a tiny window in the playfield.

I'd wonder what the latency would be on a camera/display, and could you get used to it?

That could be an interesting mode on a Catch-22 game.

Especially if my wife was playing.

I think the Korn did that on his bride of pinbot, has an LCD on top of the backbox.

For the pinball show we do in the UK I planned a camera rig setup, so you could play BSD next to Farsight's emulated version of BSD.

I rigged up an Xbox controller to the fliptronics, then had a camera and tv (so you could play the real game, but using a controller, and watching the TV - just like Farsight's game)

Anyway. Lag killed it. Completely unplayable. You would have to spend big bucks on high end gear to remove the latency from digital processing (both on the camera and tv). I did briefly consider trying to find an analog camera and tv!

It might work with a Pinball 2000 type setup. What if there was an image of actual playfield action with say a ten second delay being projected onto the glass? So you have a virtual ball bouncing around the playfield while you're trying to keep track of the real ball. Try not to tilt when you see the virtual ball heading for the outlanes. Have an award for the real ball hitting a target at the same time as the virtual ball. Could work well with a time travel theme or Dr Manhattan mode on a Watchmen pin (yes, that's a hint JJP).

Biggest issue with videoing pinball is lighting. Cheaper camcorders always have a muddy picture in ambient light and especially with low-lighting pinball tables. Some cameras (and webcams) drop the fps down to 15 or so to compensate but then you're left with blurry ball-traces.

Blasting your table with light makes for nice video but it's tough on players -- here's an example of a remote table:

There's already topics on pin-camera rigs around but I don't recall anyone reviewing small playfield cameras that perform well in low light.
--r.e.