Just add UIBlur.cs script to Camera and attach UIBlurPostEffect and UIBlur material to it.
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Kernel Size - Bigger kernels produces bigger blur, but are more expensive.
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Interpolation - Use if you want to create smooth blurring transition.
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Downsample - Controls buffer resolution (0 = no downsampling, 1 = half resolution... etc.).
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Iterations - More iterations = bigger blur, but comes at perfomance cost.
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Gamma Correction - Enables gamma correction to produce correct blur in Gamma Colorspace. Disable this option if you use Linear Colorspace.