Be thankfull you were sitting on the starboard side, image being on the other side of a full plane and just glimpsing what was going on out their window.
I recall a fantastic flight one night flying back from Corfu Greece to Gatwick. We always did night flights with a late takeoff and over the Austrian Alps was a brilliant huge thunderstorm going on up ahead and below. You get a great view of what is coming, sitting in the sharp end and it was amazing watching it as we approached. It was just like a Spielberg movie set might have looked, of cotton wool laid out over the alps and lights placed under the cotton wool, being rapidly switched on an off, constantly in different sections.
There was tremendous energy in that storm below, with flash after flash after flash, all dancing around the Alps. It was constant, about every second or two to sometimes every half second, bouncing all around the place. One of those things you just had to experience/see to be able to fully appreciate what an awesome sight it was. Words alone can not do it justice. I've seen plenty of lightning shows going on below, but none like this one, with the amount of lightning over such a large area and going on for so long. Makes you wonder what power there could have been stored, if we could work out a way to harness all that energy
It was like your footage but we were far above it all looking down. We had the warm dim glow of the panel lights and that fantastic clear light show going on up ahead and below. It was mesmerizing and with not much to do, we got to watch it for a good while until it all slowly passed underneath us. I wish we had, back then, the tiny cameras with low light capability and 4K video that we have today. I so wished I had been able to film it, it was an amazing sight. At least I got to see it and can sit back quietly today and review it in my mind, when ever I choose, but I wish I could share it, like you have for us.
You were lucky that thunder head had such energy and that you had a good camera ready to shoot with. That is a rare experience to get to see and film something like that, so close. I miss being up there looking down on a beautiful part of the world, day or night, especially the alps on a full moon night.