This is a unique ID for a camera device for the time it is connected to the system, and is never reused for the lifetime of the application.
Defined in <SDL3/SDL_camera.h>
If the device is disconnected and reconnected, it will get a new ID.
The ID value starts at 1 and increments from there. The value 0 is an invalid ID.
This datatype is available since SDL 3.0.0.