the index of the camera driver; the value ranges from 0 to SDL_GetNumCameraDrivers() - 1.
the name of the camera driver at the requested index, or NULL if an invalid index was specified.
Threadsafety: It is safe to call this function from any thread.
Use this function to get the name of a built in camera driver.
The list of camera drivers is given in the order that they are normally initialized by default; the drivers that seem more reasonable to choose first (as far as the SDL developers believe) are earlier in the list.
The names of drivers are all simple, low-ASCII identifiers, like "v4l2", "coremedia" or "android". These never have Unicode characters, and are not meant to be proper names.