No brightness variations as you would expect from flapping wings.
Perhaps they’re flying straight toward the camera, or straight away. But the dots seem kind of large for that.
The way the brightness of a couple of the dots changes when they move behind the chimney - which has sharp edges - indicates that they are very bright objects that are a long way away, many miles.
That's what I think.
Though they might be holographs of some sort, Hard to tell on film.