ČT is pretty credible and does not use other people's footage without attribution. It's most likely their crew filmed this. And isn't Radegast also sold in Poland?
I watched the program at lunch and saw no attribution anywhere. The shots are all stable and sharp, and the camera must have had a big heavy lens judging by the zoom and depth of field, and the smoothness of moving shots. There is no giveaway such as a ČT microphone in an interview but I think I've made my case with >90% certainty.
Ok, we both are probably right but mean different things. You talk specifically about this clip and I mean it more general.
I don't dispute who took the footage, I was just pointing out that the source is probably missing for some reason and that it circulates in foreign media.