It would seem pretty standard fare to use video in the process of teaching archery. A practiced eye can spot errors and inconsistencies when looking at a student shoot, then effect corrections and modifications based on the observations. The enlightened coach can take video and make it even more valuable.
Take baseline video and compare it to what the student has done from one lesson to the next. The results can surprise both the student and coach. Sometimes the student believes he has made a change when the evidence says otherwise. A video is more convincing evidence than a coach saying you’ve slipped back into an old pattern of behavior.
Ask your student to look at video and relate new positions to how their body feels. This feel of the position is extremely important in being able to replicate the position.
Have your student watch video of shooters whom you believe have outstanding form. This can be really effective, as some people are very good at aping what they see, rather than trying to implement what they are told.
If a picture is worth a 1000 words, I wonder what a video is worth?