Symbol link to pop up video on mobile?

Hi guys,

I open my page by using a colorsection with a background video. On the mobile version I’d like to have a picture in die colorsection and a “play button” symbol wich links to a pop up window playing a vimeo video. When I add a link to the symbol it always goes to a different window. I found no solution to open a pop up window.
In the following enfold theme demo is the exact thing I want:https://kriesi.at/themes/enfold-startup/

My Website is this one (the symbol is just set on the mobile version): https://maler-heilmann.s5.projekt.dev/ueberuns/

I just fixed it with adding the Video inside the page but this is not want I acutally like to have.

thanks for your help.
Bianca