I'm sorry but it looks like fake, if you look closely at the near end of the video, there are some problem with the shadow, color, contrast and displacement on the video letting me think it's a CGI
It's not CGI. The video is from 2013.
Another similar specimen was recorded in 2011.
They are a species of comb jelly (ctenophore). This one is
Lampocteis a monotypic genus of comb jellies, the only genus in the family Lampoctenidae. The sole species in this new genus is
Lampocteis cruentiventer or bloody-belly comb jelly.
They can range in color from deep red, purple, or black to pale purple. This species differs from all other ctenophores in that its body is penetrated by a deep notch located between the adjacent subtentacular comb rows at the level of the infundibulum (the funnel-shaped part). That's what allows it to 'shape shift'. There are lots of 'shape shifting' critters down in the deep!
Here's another vid on the blood-belly comb jellies.
Check out this gulper eel for some crazy shape shifting.
These videos are taken by the
Nautilus Live Ocean Exploration Trust
Explore the deep ocean through our rich media gallery featuring photos and videos from our current expedition or dive into some of our favorite moments through our highlight archives. From ancient shipwrecks in the Mediterranean to the discovery of new species in the South Pacific, our Corps of...
nautiluslive.org
Here's another shape shifter from the above link.