Once Video completed show question as Overlay

Hi Team,

I am trying to display question on overlay when video is over.

Hence following step is what I did

- Add new slide

- Insert video with controls

- Add triggers with "Lightbox" and selected the Question Slide

- Preview this slide

Output : Even if the video is over lightbox is not appearing,

I have tried adding variable as "VideoComplete" [Referring one of the tutorial here] when VideoComplete variable is changed on video complete I would like to change status of text box as "Normal".But, this is also not working.