Gblur100 uses -100- Gaussian weighted samples, which means unlike the stock blur shaders (which use 13 samples), this one can blur to extreme amounts, resulting in complete loss of focus, without noticeable quality loss. It is also variable, which mean you can tell it by how much to blur each pixel at runtime.
Moderately new graphics cards won't have any problem handling this shader, but it might be taxing on integrated cards or very old gpu's.
Also included is an oversampling parameter, which makes the blurred image glow or weaken, without using another shader. Useful for transitions, Luminosity level corrections when combining with other shaders, etc.
NOTE: the GIF compression makes the blurring look dithered due to the low color amount, at runtime the effect is completely smooth.