Can an iPad get hacked from outside? Can someone get into my iPad, access my camera and turn on the webcam and record without my knowledge? I got an email that said they did.
Any app you install can (if you allow it) access the camera. So if you by accident installed such an app and granted access to camera and microphone, yes it‘s possible. 

An attack through the Internet into an iPad with the most recent iOS version might be possible as well, but it‘s rather unlikely. 

PS: The mail you got might just be spam though