Yep, agree w\ @Seapup. Definitely a floating object really close to the lens. A microscopic flying bug or dust moving in the air current. Too close to the cam to get focus, that’s why it’s blurry.
Because it is in Black and White, this means the IR emitter lights are on and flooding the field with IR light. Anything that gets close to the cam will be lit up like a spotlight reflecting all that IR light.
This is a microscopic bug that got caught in a spider web across the face of the cam. Initiated motion Event videos for hours. If you look close, you can see other fast moving flyers streaking across the frame as well.