The explanation is that stars are basically point sources because they are so far away, so the diffraction within the atmosphere creates these optical effects. The idea is that for planets and the sun their sources are disks rather than points, so the effects of diffraction average out across the apparent surface. This seems plausible but the video you show seems to show coherent structure at each frame rather than random colors and points as one might expect. My guess is that what we are seeing is an artifact of the detection mechanism and zoom algorithms employed by the camera. Some kind of averaging effect might be occurring between each sampled frame which makes each frame seem to have a coherent structure.