That was what I was afraid. Too bad. I don't see a use case for embedding videos, I was thinking more of the MapPolyline and other types to render geometry on top of the map, like the route to follow or points of interest (like gas station in car mode). Not sure how easy it is to do with an older Qt. I took a look at the MapBox GL before, but it is a huge piece of software, and I didn't understand all the subtleties of what it can do, and how to integrate it correctly in an application. I'll take a look again. Can you describe your linux setup to see if I can replicate it here and maybe help ?
qputenv("MAPBOX_ACCESS_TOKEN", "HERE GOES THE TOKEN");