This is the prototype.
The sferical mirror is a little mirror for bicycles, that produce an angle of vision of 50 degrees aprox (the original cammera have less than 20 degrees)
With a barrel distortion filter can be easily corrected
All system cost to me less than U$S30, included the cammera (in Argentina)

Very cool idea.  I might have to try something like it since my wide angle lens did not work out.

Keep us updated and let us see results!  I’d be interested in seeing a picture from the cam.