This video is called Common Inkcap Mushroom.
Translated from the Dutch Mycological Society:
Wednesday, August 13th, 2014
Preceded by much rain, last week at different places in North Holland province common inkcap fungi appeared. Also, in a recreation area north of Alkmaar they were found. Nothing special you might say, because common inkcap fungi are common. By chance, in this area not only common inkcap fungi occured, but also some specimens of the rare Coprinopsis romagnesiana inkcap fungus were discovered.