would be great if someone could help me to identify the piece of classical music which is played as background music in this video

I tried different search tools for classical music but unfortunately the quality is so bad that it did not work. Could be that the music piece is written for ballet. After hours of listening to endless streams of ballet music my ears started bleeding i am i a kind of stuck.

I am grateful for every hint.
(If you do not know the piece > any ideas how I could identify the song by myself?)

Kind regards