how to embed a .mp4 video the url postfix with secret key

You must have to open this URL in iframe to display as embed format. 

<!DOCTYPE html>
<html>
<body>

<iframe width="420" height="345" src="https://www.youtube.com/embed/XGSy3_Czz8k">
</iframe>

</body>

For more about IFRAME Please visit this link
https://www.w3schools.com/html/tryit.asp?filename=tryhtml_youtubeiframe

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