.....at : https://youtu.be/YN6mCocYVsU
     and his possible "formula" (simplified " principle" design ) at :
     http://www.geocities.ws/iacob_alex/Some_Drafts/text028.JPG
     ...is a common lever(age), playing a cyclical variațion of a single arm : long arm (top position) -short arm (down position) , so to obtain a continuous gravity unbalance on the same side of the fulcrum , due to the gravity fall and rotational inertia.
     Al_ex

youtube link you posted says : Video not available

   Hi !
The rectified address on youtube : https://youtu.be/YN6mCocYVsU
Errare humanus est...
  Al_ex

The wheel of destiny only keeps going because of the tremendous amount of energy put into it by the performer.  And in addition there is no energy being extracted from the moving wheel.