Dear paolo, scuse me but this is my fault for not add these parameters. I proceeded immediately to resolve the problem with the new version you can upgrade, you must use the shortcode in this way:
[sz-video url=”url” autoplay=”Y” loop=”N”/] or
[sz-video url=”url” autoplay=”Y” loop=”Y”/]
Here the sample page con youtube and autoplay
https://startbyzero.com/demos/wordpress/plugin-video-con-autoplay/
good job, works beautifully thanks.