As Unity only provides blur as a post-processing effect, I developed a simple shader that would display the image behind it with a gaussian blur effect applied to it. The intensity of the effect can be tweaked using a slider.
IF YOU ARE SEEING THE DEFAULT PINK SHADER: This Shader uses GrabPass for taking the image behind it. GrabPass internally uses RenderTextures, which are a Unity Pro feature. So unless you have Unity Pro, I’m afraid you will not be able to use this shader.
For a demonstration, access my blog .
Disclaimer: I offer this shader for free and I only maintain it in my spare time. My apologies if I don't always answer on time.