Hi Prof  :)
I discover how add video first must have program
Quick time for window after install Quick time begin
Make video by snapshot for simulation or capture video for simulation
And after it "add element" video and insert your video that you do
After this you can control in show video by time or velocity etc..
For video begin show for example from left to right or from up to down like it
I know all this by my self i send email to home ejs about element add video
But they No answer me so i stay 2 days still i discover  ;)
This element can help for do presentation for simulation is very interesting
Respect Prof
Ahmed