ESP32-cam instead of a usb webcam

Hi, congratulations on the code, everything works.
I need to get the code to work with an esp32-cam.
I have the esp32-cam streaming video at the link http://192.168.1.3, and I would like to use it instead of the usb camera. 
I don't know where to change the code and how to do it. 
Can I get help?
Thank you.