That was a great API feature, eh? 
With the Mapillary API v4, all the old tools (or in this case, API calls) broke.
Here’s a quick Perl script to get GPX sequence[s]. For convenience, a single image ID can be specified from each sequence.
https://www.openstreetmap.org/user/richlv/diary/400630
I’ve successfully used it to grab a GPX of my walk and upload it to OSM.
Useful when I forget to carry the GPS with me and have to rely on Mapillary uploads
I still had to manually hunt down a whole bunch of images in the Mapillary web interface, copypaste image IDs etc, but that’s kinda better than nothing.
For my own use, I’d love to filter by user, camera and date in a bbox, but Mapillary API got so seriously nerfed with v4…