Melting point of typical solder.
.. with a typical melting range of 90 to 450 °C
You are correct, there is no proper specification about this camera and the only source might have been the ROHS certificate. In 2006 EU prohibided the use of solder in all general use appliances, except capacitors. *As of point two in the wheras directives. So to be ROHS certified they must have used Lead Free Solder
popular lead-free solder alloy family is based on the reduced melting
point of the Sn-Ag-Cu ternary eutectic behavior (217 ˚C)
You still have the problem of the plastics which may start to melt over 100deg Celsius, deform or whatever else. The PCB can withstand up to 180deg Celsius for short periods but long exposrue may cause it to warp or start to smoulder. And it smells really bad!
Unless otherwise specified, you should not expect it to work too long under higher temperatures than 80deg Celsius. Like @Steve Robillard linked to the question, the IC and other electrical equipment might start to fail at about 100degrees Celsius too.