Many UFO sightings are explained by reflections within the atmosphere or by celestial bodies such as Venus, or the lights of a helicopter or plane. At night, it can be hard to judge distance so a faraway helicopter carrying a very bright light (which they do) can appear to be a close, silent object.
In daylight, it's not so easy to dismiss the sightings. It's harder still when there's film, even harder when that camera moves around, so it can't be something on the lens. When the film shows others looking at the same object and an amateur cameraman having trouble with focus while zooming, then it becomes very difficult indeed to explain the sighting as 'something ordinary'.
This video shows something in the sky. It's a real something, it's not an artefact of the camera, it's not a plane or a helicopter and if it's a balloon, it's not like any I've seen. It's too long even to be a zeppelin.
It's an object, it's flying and it's unidentified.
Alien, or some Earthly experimental machinery? You decide.