WiFi camera can be handy in many areas where you don’t want tracing wires. They are not expensive if you are looking for complete solution. If your application isn’t critical then why not building one by yourself. Johan simply took two well known modules – arducam and ESP8266 module. He built a baseboard to fit hem both including power supply solution and couple other features like optional SPI flash, FTDI connector.
He called his development esparducam – the combined name of both modules. He wrote a demo application where it is possible to get images by using HTTP GET method. If you would like to give it a try, follow his project Github page.