Hi, thanks for asking,
Blur Texture: This texture type can be used for real time implementation of Depth of Field
(DOF) or for the real time implementation of Screen Space Ambient Occlusion (SSOA).
To use blur texture, follow the given steps:
-Go to material pool.
-Take a blur texture.
-Apply it into the material which you want to get blurred.
-Tweak the parameters accordingly.
Hope this resolves your query.