The Median effect replaces each pixel with a pixel that has the median color value of neighboring pixels with the specified radius. At low radius values, this effect is useful for reducing some types of noise. At higher radius values, this effect gives an image a painterly appearance.
In the Properties Window you can change the effect properties. The only property of the Median effect available for setting is its level.
On the figures below you can see the video picture before and after applying the Median effect:
Before applying the Median effect
After applying the Median effect