i would be careful about only bluring documents on one axis like that, there's ways to easily reconstruct the original text and deblur it, it works especially well on a motion blur in one direction like that. yt video compression probably makes attempts entirely non-viable but it's best to completely black out or use large mosaic block censors (don't use small mosaic censor either, theres similar reconstruction attacks based on temporal accumulation, similar to how temporal image upscaling works.)