Tweaks to optical flow smoothing

applications/gui/src/src_window.cpp

components/common/cpp/src/cuda_common.cpp

components/operators/include/ftl/operators/disparity.hpp

components/operators/src/depth.cpp

components/operators/src/disparity/cuda.hpp

components/operators/src/disparity/optflow_smoothing.cpp

components/operators/src/disparity/optflow_smoothing.cu

components/operators/src/nvopticalflow.cpp

components/operators/src/weighting.cpp