The BCC Radial Blur filter creates a blur around a specific point, simulating the effect of a zooming or rotating camera.
The Amount option specifies the amount of blur, depending on the selection for Type. For a Spin blur, which applies blurs in circles around the center point, the Amount value indicates the degree of rotation. For a Zoom blur, which applies blur that radiates out from the center point, the Amount value specifies the degree of radial blurring.
The built in PixelChooser, with integrated mocha planar tracking allows for greater control over which areas of the image the filter should affect.