The Video Processing Subsystem driver abstracts the included video processing elements and presents the processing chain as a black-box. It shields you from the internal workings of included subcores and thus provides an out-of-the-box solution for video.
The subsystem driver is a bare-metal driver. It dynamically manages the data and control flow through the processing elements, based on the input/output stream configuration set at run time. Internally, it relies on included subcore layer 1 drivers to configure the IP hardware block and layer 2 drivers to provide an abstracted view of the feature set provided by each subcore.