A YouTube video (posted July 4) that's been making the rounds lately, shows Italian guitarist, Vittorio Camardese, showing off his own two-handed tapping technique on an Italian TV show (on the RAI network) in 1965.
In the video, Camardese says he's an amateur guitarist who works at Rome's San Filippo Hospital, (as a radiologist),. He says the guitar was loaned to him by a coworker!
If you don't want to listen to their conversation, (which is all in Italian), skip ahead to 1:14 — although the real playing starts at 1:30. After a break and some more chatting, Camardese starts playing, the classic Jazz Standard, "All of Me," at 3:10. He breaks into some tapping again at 3:53.