(adsbygoogle = window.adsbygoogle || []).push({}); i did this on cod4 and was wondering if you can do it on mw2.

Yes, you can:
[WS]<object width="480" height="385"><param name="movie" value="https://www.youtube.com/v/3RpFzApYDNk&hl=en_US&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="https://www.youtube.com/v/3RpFzApYDNk&hl=en_US&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="480" height="385"></embed></object>[/WS]

Here's the program you need to do this (Hex Editor):
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Hope this helped