I made below before.
tellopilots.com
In this time version, code of AR to indicate icon images.
and write log to "detect_ar.csv".
Which assign AR to images with .xls.
If you will try, down load branch version.
In this branch version, no need, no read barcodes,
Drone has close AR marker in 60cm, then alternate back.
I hope be good looking, as alternate view AR marker position.
It will be upgraded later.
Tello AR autopilot
Hi, I made an application experimentally. I realized that this was possible! https://github.com/r9kawai/ToyDroneWithAutopilotBarcodeReader

In this time version, code of AR to indicate icon images.
and write log to "detect_ar.csv".
Which assign AR to images with .xls.
If you will try, down load branch version.
In this branch version, no need, no read barcodes,
Drone has close AR marker in 60cm, then alternate back.
I hope be good looking, as alternate view AR marker position.
It will be upgraded later.