VideoInterface: Add method to dynamic_cast inner video method to given type to access increased functionality.
VideoInterface: Add method to dynamic_cast inner video method to given type to access increased functionality.

renzodenardi/Pangolin,randi120/Pangolin,mp3guy/Pangolin,renzodenardi/Pangolin,wxdzju/Pangolin,stevenlovegrove/Pangolin,arpg/Pangolin,mp3guy/Pangolin,tschmidt23/Pangolin,stevenlovegrove/Pangolin,visigoth/Pangolin,janjachnik/Pangolin,pinglin/Pangolin,visigoth/Pangolin,tschmidt23/Pangolin,wxdzju/Pangolin,stevenlovegrove/Pangolin,randi120/Pangolin,mp3guy/Pangolin,pinglin/Pangolin,tschmidt23/Pangolin,janjachnik/Pangolin,arpg/Pangolin