Most "motion blur packs" you download are actually just a set of instructions for OptiFine.
Evaluation of Motion Blur Implementations in Minecraft 1.8.9 1. Abstract motion blur texture pack 1.8.9
Kai laughed. “Texture packs don’t create motion blur. They change pixels.” Most "motion blur packs" you download are actually
Kai sidestepped the lava trail before it existed. motion blur texture pack 1.8.9