Watching the video, it is obvious to me that the object is very close to the ISS, and is relatively small compared to the ISS solar panel in the shot. Its brightness is reflected Sunlight.
If the object were very far away, the perspectives would have changed as the camera zoomed in. The fact that the relative spacing of the object and the solar panel remains constant as the camera zooms tells me that the distance between the two is not very great.
Probably a hunk of ice or other debris from the ISS.
Is it blue ice?...................toilet leaking?.........................
Oh come now, we can’t let facts get in the way of a UFO conspiracy.
Overall space debris is a considerable concern to the space community and I'm sure that they don't just toss trash or even frozen waste overboard. If it's out there and it came from the ISS, it's not debris. It's a satellite.