Google something like "Audio to MIDI software" or "Pitch to MIDI".

Sibelius etc. can import MIDI, though the accidentals are yet another source of error.

To notate existing recordings, the software can save some time, though it still requires a lot of corrections by ear. But it is hardly reasonable to use it the way you want to, because you will probably end up slower than with conventional input (unless you are musically disabled, in which case you should not compose at all).

I once saw a "MIDI guitar" with electro-mechanic operation (no acoustics involved), which is a slightly better idea. Google will help you with that.