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Well this obviously is possible, because otherwise the video wouldn't be available ;)
The hector_slam setup is following the conventions laid out in the SettingUpForYourRobot tutorial. The octomap is created by feeding Kinect data to a octomap generator node. This part is using tf data generated from SLAM+IMU and essentially performs mapping with known poses.
To reproduce what is shown in your video, you'll want to get SLAM working and have a proper robot model (i.e. have the Kinect mounted correctly on your model and a complete tf tree). Generating the octomap then boils down to feeding the Kinect data to a octomap generator node. The underlying ROS tools (tf, octomap) then will do their magic and create a map.
These slides provide a brief overview.
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