This is not possible, since there is no such event in the iFrame API . Although this is not possible, you can try something like this if you need a video to put an end to a specific item, for example, you can use the download options for this, for example.
loadVideoById({'videoId': 'bHQqvYy5KYo',
'startSeconds': 5,
'endSeconds': 60,
'suggestedQuality': 'large'});
onStateChange , , ..
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