While primarily for Java, some bedrock shaders like ReTo-Shader or specially tailored Motion Blur Packs (.mcpack) can be found on MCPEDL. 2. Guide: How to Install & Enable
Disclaimer: Always download MCPE mods from trusted sources like MCPEDL or CurseForge to avoid malware. The author is not responsible for account bans on Realms for using modified rendering clients. motion blur texture pack mcpe extra quality
Find a reputable .mcpack file for a motion blur texture pack. While primarily for Java, some bedrock shaders like