Hard to say......Nothing to scale it to

http://www.storsjoodjuret.nu/

It almost looks like a fishing lure, to me.

Or the opening scene to "Look Who's Talking".

To me it looks like a worm in the water.

It does not seem to be swimming with any direction? Just floating and squirming about.

a sea snake?

This borders on the useless. Any English commentary? I even looked at the other vids on the website. Nothing even remotely compelling.

Spoke to this random Swedish citizen and his chicken, he's screamin B.S...Well, I THINK that's what he's screamin, anyway. The chicken had no comment.

The water is greenish yellow you can't really make out what it is?

Nothing at all worthy of any conclusions.

nothing to compare size too. for all we know it could be an ordinary worm or a piece of string

Looks like a small worm squirming in a jar of murky water. A miniscule cryptid that might give you diarrhea if acidentally swallowed.

Yeah, but it would be "previously unknown" diarrhea, right?

Cryptid poop? Eww.
So, no one has an English translation?

Would have been nice to have something to compare size to.

The English translation is within the OP link.....

http://www.storsjoodjuret.nu/ Top of the page, on the right hand side, there's a Union Jack symbol......click on it to get the English version

Reminds me of my microbiology labs... definitely looks like a closeup, the blur isn't consistent with the usual blurry films you see.