The BCC Match Grain filter copies the grain signature from a source clip
and applies it to a destibation clip. This allows for more realistic
compositing. Grain that has been sampled from a source clip can also be stored
and reused with the separate Grain Preset options
The built in PixelChooser, with integrated mocha planar tracking allows for
greater control over which areas of the image the ﬁlter should affect.