You can a Youtube video popup to your individual products. In order to do so, you must first enable the Data 01, Data 02 and Data 03 field by visiting backoffice > Settings > Workflow and enable the „custom template data“ option. Once that is enabled, a new set of field will be added at the bottom of your products forms.
To enable the Youtube video popup, simply copy the youtube video id (https://www.youtube.com/watch?v=oM6jhFdquH8 <- this part in bold) into the Data 1 field. This should display a “watch video” button on your product page.