The problem is that I did place a video content in a division and scaled down the width of the division till zero. The overflow hidden was a big help for me since I wanted a closing window through time for the video.
The trick functioned but the video was a little bit shaking because of adjusting it to be exactly at the center of the division which was resized through time.
To solve the shaking problem the only solution that I see is to resize a Masking path and have the vid element in a fixed position.
I have been searching now during a week for a solution but no luck.
Any clue or help on this matter is very welcome and thanks in advance.