JavaScript:

document.getElementById('my_youtube').src = 'https://www.youtube.com/embed/VIDEO_ID?autoplay=1'

HTML:

<iframe id="my_youtube" width="560" height="315" src="https://www.youtube.com/embed/VIDEO_ID" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe>

İnternette buldum umarım işinizi görür.

Selamlar