Fascinating.
This looks to me like some sort of ritual, or ceremony. Maybe pagan ?
At 2:14 it looks like a female figure to the right of the tree, facing left, kneeling, then leaning forward making some sort of offering, or reaching out with her hands pointed upwards as if to press her hands against the tree.
At 2:38 what appears to be a robed figure to the left of the tree, holding what appears to be a staff, turns towards the stream with his/her arms raised slightly what looks to be some kind of prayer.
Actually the impression I get is that it's not so much ritualistic, or prayer like, but reverence and respect for nature.
My 2¢