I can echo the difficulties here. One way to improve the quality of tracking is to take the video in exactly the same way, with the same lighting. I chose the bathroom (assuming you don’t move a lot), and took the video by panning the phone slowly above my head, from left to right, the front to back.
Turned out that the angle made a huge difference in the visibility of my hair loss (top/crown area).
Minoxidil hasn’t done anything for me, and by looking at old photos from the “right” angles, I realized that I had that loss pattern even 10 years ago, and it hasn’t really gone worse since.
What worked far better was going blonde.
2019, roots - meh
2020 - full blonde, also hides the white hair.