First I’d like to say that I love your tutorial. I can tell that you really know what you’re talking about.
This is constructive criticism so please don’t think that I’m trying to say that your tutorial is bad.
First off try to script your tutorial. I.E. write down what you want to say and learn it.
When you’re talking, talk to the camera. Keep eye contact with your viewers, it makes them feel part of your tutorial.
Have 2 set of shots. Set one, you talking to the camera. Set 2, you playing or showing a technique on the guitar.
Do you have a mic socket on your camera. If you have, get yourself a tie (clip on) mic.
Don’t worry about getting another camera, it’s not bad quality and people will watch because you know what you’re talking about.
I hope this helps and I’m looking forward to seeing your next tutorial