The BCC Z-Blur filter uses a Z-map image to emulate a rack focus effect.

Move the focal plane through the source image, using the Z-map to control the
focus. Adjust the focal point, depth of field and blur parameters to finetune
the area of the image to blur.

You can also set a channel from the image clip, then use that channel to
control the z-blur effect. This type of effect is most noticeable in real life
with a long focal lens, such as a 105mm or greater zoom lens.

The built in PixelChooser, with integrated mocha planar tracking allows for
greater control over which areas of the image the filter should affect.

To learn more about this filter, and see a breakdown of the various controls,
please click here.