Hate to burst your ghostly bubble, but… You can see it’s legs when it crawls on the lens. Stop looking at the object as floating, look at it like it’s walk on the lens, and you’ll see the legs as it turns in the upper corner of the lens. It’s blue because of the lighting used up by the camera. It’s not transparent , you can’t see through the center only the blurry edges.
People have been reporting “spots” on camera lens for years as ghost. So this is not the “First time”.

If you still think it’s a ghost , I have prime swamp land in Florida that I don’t own that I would like to sell you ☺