The videos are on the machine at the end of the hotdesk area in the MRL. The machine should be on and an ubuntu VM should be running. If not, please start the VM using VirtualBox.
Check that /media/sf_marathon/videos/ exists and contains all the marathon videos. If this isn't the case, you'll have to share C:\marathon with the guest OS using VirtualBox. Make sure the directory /media/sf_marathon/videos/output exists. If it does not, create it.
Change to the video annotator's directory.
$ cd ~/p/video-annotator
Pull the branch origin/server from https://github.com/tfogo/video-annotator.git