John van Doorn from Woerden in the Netherlands, the maker of this video, writes about it (translated):
This male sparrowhawk flew against my window. He was unconscious. I gently wrapped him in a small towel and took him inside. The bird came back to his senses and became conscious and alert to his surroundings. After a few minutes he had recovered completely. Furthermore, the sparrowhawk looked all right and I let him go.