The following requirement must be fulfilled:
Desired videos are available in the library.
To play back a video, proceed as follows: 
1.
Click the Videos library entry in the navigation tree on the left.
à
The video browsing screen is displayed in the stack view. Another double-click changes into the detailed browsing view that is displayed with focus on the first item of a selected stack. 
2.
Select the respective video that you want to play back and click the Play button on the lower task bar.
à
Playback is started. The Playback screen is displayed.
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If you selected your video from a stack that contains more than one video, the playback is automatically continued with the following video.
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You have started the playback of your video.
See also
Video Browsing Screen
Video Playback Screen

Starting Video Playback (Library)