Get info on the drive by selecting it on the desktop and hitting command+i.
In the sharing and permissions section highlight your user, make sure you have read & write permissions then click the gear icon at the bottom. This should allow you to set ownership of the drive.
I’m looking at this again this morning and I see the same thing on your video as I do here and this looks like the expected result.
You are using the smooth function and there is still some movement and you are seeing the interlacing that is present even before the filter is applied.
You may want to try using stabilize as opposed to smooth.