The brief segment of footage we will be examining here was shot back in 1991 during shuttle mission STS-48. In this case, the footage shows an unidentified object that initially enters the field-of-view at the bottom center of frame.
The object in question that I focus on can be seen experiencing deviations in flightpath shortly after it becomes visible, so in order to better delineate those non-ballistic movements, YouTube User StarGazer Nation shows several flightpath tracking and trace enhancements here that allow for an accurate look at the changes in velocity vector that the object experiences as it traverses across the FOV.
Unfortunately, based on the limited evidence available to us, there is simply no possible way to make any kind of credible size or range estimations for the unidentified objects seen in this sequence.
As you will see, it is pretty clear that the primary object he focus’ on and does not maintain a purely ballistic trajectory, with the movement profile demonstrating there are indeed several changes in the velocity vector occurring.