Upload the image on Imgur and post the BBCode here.

But anyway, if you haven't done so, you'll have to check the camera settings if it has the option to flip the rear camera image. Otherwise, there's nothing much that can be done other than use a video editing tool or player like VLC to flip it back to normal once the file has been extracted.

Worst case, you would only have to do this if you need the footage for something (ie. after an accident or reviewing a notable event).