In order to Run the ros bags, this folder is designed to give you access to the correct message definitions. Additionally you need the mocap packages.
https://github.com/MOCAP4ROS2-Project/mocap.git commit: 1985ac9
https://github.com/MOCAP4ROS2-Project/mocap_msgs.git commit: cfca28f
use: ros2 launch mocap_marker_viz mocap_marker_viz.launch.py mocap_system:=qualisys to start the visualization of mocap markers in RViz