How to get camera serial number from EXIF ?
First the camera would have to write its serial number to the EXIF data. I don't know of any that do.
But in any event, you'll have to check with the documentation of the specific camera in question to see if it writes this value and where it writes it. There's no standard place for it, since it's not a standard thing to write (such as
You can see a lot about the EXIF specifications here.