Couldn't understand what you were saying in the video. use a separate mic for the speech, talk a bit slower and louder compared to the video, if possible play the runs slower on the instructional part and articulate better since it's an instructional video, and if the pupil can't understand what the instructor is saying, it's not a good thing. Also there is an annoying hum in the background, you might want to try to do something about it. Also I wouldn't mind if there was like text floating at certain points to show stuff like chord names, fingering etc