Based on the video, the color is pretty easy. It’s their lights. Have you ever seen how light spreads in fog? It looks pretty much exactly like what we see in the video.
As for the smell, are they burning incense? We have to remember, fog is essentially water in the air. That’s what causes light to have the properties it does, and could also result in the ash of the incense being carried all throughout the area.
It could also be miraculous, who knows? They’ve never done a study on it in the way the Catholic Church studies supposed miracles, so it’s hard to say. It’s another instance like the Holy Fire. I can see multiple natural explanations for the event, so I’ll stick with those until they are ruled out.
Catholics don’t discount the potential for God to perform miracles in places other than Catholic territories. It’s building up the faith of those believers, even if that faith isn’t 100% aligned with His will. Catholicism has plenty of miracles to it’s name, we’re happy to share with our Orthodox brothers and sisters.
(Watching it more, that coloration is clearly the result of the lights used to illuminate the fog so it could be filmed)