It sounds like a behaviour which has been talked about on the forum before. If I’m thinking of the right thing, it almost looks as if they are scent marking, but also maybe rubbing their chins. As I recall we didn’t reach a definitive answer, but it is something which seems to happen quite often.
If the video is somewhere else on the internet, you can put a link on the forum. If it isn’t you can put still images on Hedgehog Street:
That used to take a few days to get there, but may be quicker now – not sure.
If you can’t use a link, let us know when/where the image is.