"camera_pins.h" library

This file is part of an example sketch. It is not in a library that is accessible from any sketch.

You might be used to seeing #include directives used to add resourced from libraries to your sketches. However, sketches can contain header files, and you can use #include directives for those files as well. That is the case with the "CameraWebServer" example sketch. The sketch structure looks like this:

CameraWebServer
|-- CameraWebServer.ino
|-- app_httpd.cpp
|-- camera_index.h
`-- camera_pins.h

So open File > Examples > ESP32 > Camera > CameraWebServer. You will now have the example sketch that contains the camera_pins.h file open in the Arduino IDE (note that there is a camera_pins.h tab). After that, you can modify the example sketch however you like and save the modified sketch to some convenient location on your computer.

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