think.

A spider web on or near the camera blowing in the breeze.

Bit of fluff or pollen stuck on a strand of spider web drifting in a slight breeze, too close to the camera for it to focus.

... very close to the camera, so it's out of focus.

Is that a chipper?

and it releases corn every so often. The webcam is sponsored by Chevrolet.

It looks like a giant chipper to me. I thought it was full of chopped up trees/branches & the critters were checking it out.

Looks like a ghost.

Obviously, the deer that walks into the foreground is not at all bothered by the presence of something moving around, so it's most likely a camera/lighting artifact of some kind, and we know utterly nothing about the physical arrangement of the camera and the lights. It also obviously an IR lighting arrangement of some kind, since the animals are casting shadows - so it's not passive IR.