1. USB Cam node
cd ~/catkin_ws/src
git clone https://github.com/uvify/usb_cam_vo.git
cd ..
catkin build usb_cam_vo
source devel/setup.bash
roslaunch usb_cam_vo uvify_cam.launch


  1. Optical flow node
cd ~/catkin_ws/src
git clone https://github.com/uvify/optical_flow.git
cd ..
catkin build optical_flow
source devel/setup.bash
rosrun optical_flow optical_flow_node