Apply one or two drops of high-concentration (90% or higher) isopropyl alcohol around the perimeter of the rear facing camera.

Wait two minutes for the isopropyl alcohol to weaken the adhesive underneath the rear facing camera.

Alternatively, you can heat an iOpener and apply it to the top left corner of the rear cover for two minutes to weaken the adhesive securing the rear facing camera.

A hair dryer, heat gun, or hot plate may also be used, but be careful not to overheat the iPad—the internal battery is susceptible to heat damage.