how to prevent youtube video click go youtube site?

In another word,

how to make youtube click on video goes to another URL? affiliate link for example.

Thank you

That's not possible. You can't change the default link behavior of an embedded YouTube video. Not in the iFrame and not in the older object version.

If that would work it would be a huge security vulnerability.

See these documentation articles for your possibilities on how to embed a YouTube video:

• Embed a YouTube video
• YouTube Embedded Player Parameters