Simply copy the pose_interpreter_networks ROS package from this directory to your catkin workspace:
cp -Lr pose_interpreter_networks/ ~/catkin_ws/src/The ROS package contains many symbolic links to files elsewhere in this repository, so the -L flag is required in order to resolve the symlinks when copying.
Note that the requirements for the ROS package are different than those used in the rest of this repository. In particular, ROS does not support Python 3, so you will need to install Python 2 along with the corresponding pip dependencies. See the README inside the package for more details.