@tomr, I have a WordPress site where I installed the WP Mautic plugin - https://wordpress.org/plugins/wp-mautic/.
Then I used the shortcode
[mautic type="video" gate-time="#" form-id="#" src="URL"]
Replace the # signs with the appropriate number, where
- gate-time is in seconds (how many seconds after the video started should the form come to action),
- form-id is self explanatory (go to Mautic Components > Forms and see the ID of the form in the right column)
and URL is the URL of the Youtube video.
That’s pretty much all. Hope it helps.