try this code
<iframe src='http://www.youtube.com/embed/rxSwgvMg-H4?modestbranding=1&showinfo=0&fs=0' width='300' height='175' frameborder='0' >
</iframe>
working link:
Remove Red color from play button:
<center><iframe src="https://www.youtube.com/embed/HAR49CWiEjY?modestbranding=1&title=&autoplay=0&re l=0&controls=0" type=”application/x-shockwave-flash” frameborder="0" width="600" height="400"></iframe></center>