This is a paid asset, but now you can download Fast Motion Blur (Mobile, URP, VR, AR, LWRP) Free.
Detail this asset from Unity Store: Original Link
Fast Motion Blur ( Mobile , URP , VR , AR , LWRP ) v1.2 (Latest version)
Fast Mobile Camera Motion Blur v1.1
“If possible, please buy the package to support the developer”
Works with Unity versions higher than 2017.1.0f
LWRP works only with Unity versions higher than 2019.1.0f1
URP works only with Unity versions higher than 2019.3.0f3
VR works for single pass and multi pass rendering
Note that effect is applied to camera, BUT some objects can be excluded from motion blur effect.
Fastest Solution on the market
This package consists of the shader for applying the motion blur on the screen. This solution is currently the fastest approach in the market-oriented specifically for mobile devices. The shader was tested on the low-end mobile device in a loaded scene in order to optimize the performance and fps.
SHADERS
* FAST MOTION BLUR – The fastest camera motion blur in the Asset Store. Completely optimized . Runs at 45-55 FPS on a low-end mobile device(with proper settings).
All the testing was made on low-end mobile device Meizu M2 Note in the scene containing:
-101 different gameObjects,
-101 Materials,
-1 Directional Light(realtime),
-45k polygons
 – Free Download){kind=link}