There was a false start because I suddenly realised I had the Canon M50 set to manual focus instead of autofocus. Aaargh! Blurry video!
Fortunately I realised before I'd gone too far and I hadn't planned to use the first few hundred steps anyway due to not wanting to reveal exactly where I live. I put the camera back onto autofocus before carrying on. I think the rest of the videoing went OK. I am quite pleased with the resulting photograph, but I won't share it until the video is complete.
I did cheat a little once I got back home by re-shooting me leaving the house, but blurry footage would have been no good at all.