The Polygon, Pie, Simple Pie, Sector, Simple Sector effects allow you to highlight an object in the video by setting out an object which is covered with specified color while the rest of the picture remains untouched.
In the Properties Window you can change the effect properties. The properties of the Polygon, Pie, Simple Pie, Sector, Simple Sector effect available for setting are brush type and other properties depending on the chosen brush type. There are the following brush types in the dropdownlist: solid, gradient, hatch, texture. See the description of all the types here.
It's also possible to change the location and size of the polygon/ pie/ simple pie/ sector/ simple sector like while applying the ellipse effect. Click here to learn more about it.
On the figures below you can see the video picture before and after applying the Pie effect:
Before applying the Pie effect
After applying the Pie effect