Please use josn board manager script from http://www.arducam.com/downloads/ESP8266_UNO/package_ArduCAM_index.json to download ESP8266 UNO board support files.
Please use josn board manager script from http://www.arducam.com/downloads/ESP8266_UNO/package_ArduCAM_index.json to download ESP8266 UNO board support files.