This is a compass jellyfish video from Italy.
From Practical Fishkeeping in Britain:
A rare compass jellyfish has found its way to a holiday resort in Cornwall after it was blown off-course by the wind.
The lone jellyfish, which was caught by the RNLI on Towan beach in Newquay, has now been placed on display at the local Blue Reef Aquarium.
Compass jellyfish, Chrysaora hysoscella, which gain their name from the v-shaped markings that resemble a compass rose, are usually found in deep waters offshore.