Thank you for this very good plugin norihiro, but I have a somewhat peculiar use case which involves face tracker cropping settings applying to another source in real-time. Or in other words, applying the face tracker cropping to not only the original source with the face, but also another source with or without a face. I need this because I have another source which generates a synchronized mask for the source with the face. This mask source needs to have the same cropping so that it could be stacked on top of the source with the face later on, but not beforehand(because of some limitations I cannot circumnavigate). I know this might be a little too much to ask, but this functionality could also be used to control greenscreen backdrop with the movement of the face.