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			            The screen area inhabited by the video needs to be constantly re-drawn, because a video -- in essence -- is just a rapid series of static images. You thus cannot overlay a <picture> on a <video>. The <picture> would be visible for a single frame and then disappear once the screen-area inhabited by the video gets re-drawn the next time. Your only option is to overlay the <video> with *another* <video> as in
  / stimulusframes = [1=backgroundvideo, overlayvideo]                 
			            				
			                                 
                     
                                            
                         
                    
                  
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