I was wondering the same thing. To me, the camera work looks very confident (smooth, even panning). Almost as if they knew exactly where the rocket was behind t

I was wondering the same thing. To me, the camera work looks very confident (smooth, even panning). Almost as if they knew exactly where the rocket was behind the clouds. Infrared sounds plausible. Or maybe they just have an high-res camera that captures a large portion of the sky. Some student would then post process the video by zooming in and panning accordingly.