This fiddling with video has me looking for small cheap video cameras. 123 Security Products has some, but Pine Computer has them cheaper. Better yet, they’ve got a 203CA sub-mini video camera with interchangable lenses for $25. The standard 4mm lens has only a 78 degree view angle, but an available (+ $15) 2.5mm lens should result in a much more useful 125 degree view.
The cameras all have composite NTSC outputs, but a USB video converter make them “digital.”