There's really no way to do this but in some circumstances you can deceive the eye! Won't work in every case.
Create the video slide so that the video auto runs and the transition is set to auto after zero seconds (I know but stay with me!)
Now create a duplicate slide and place BEFORE the previous slide
You need to stop the first video playing which is harder than you think!
In the animation pane remove the animation and with INSERT > Action remove the play action.
Clicking the first video should now take you to the second video which will auto start and move the next slide when it ends (Ithink!)
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