Rectangular privacy mask shape is not sufficent. Best option would be a polygon with 4 corners that you could freely adjust. I have tried to work around this by drawing smaller rectangular boxes close to each other to form a more complicated form, but there is a limitation of 4! masks you can apply, so this method does not help either.

Rectangular privacy mask shape is not sufficent. Best option would be a polygon with 4 corners that you could freely adjust. I have tried to work around this by drawing smaller rectangular boxes close to each other to form a more complicated form, but there is a limitation of 4! masks you can apply, so this method does not help either.