title: how can get direct link from youtube video with youtube api v3
body: <p>I have seen multiple sites that use <strong>direct link</strong> from youtube.</p>
  
  <p>For example, for this youtube link :<br>
  <a href="https://www.youtube.com/watch?v=yY6ex5Dqkks" rel="nofollow">https://www.youtube.com/watch?v=yY6ex5Dqkks</a></p>
  
  <p>the direct link for quality 720p is :<br>
  <a href="http://r12---sn-n4v7kne7.c.docs.google.com/videoplayback?sparams=dur,expire,id,initcwndbps,ip,ipbits,itag,lmt,mime,mm,mn,ms,mv,nh,pl,ratebypass,source,upn&amp;key=cms1&amp;mime=video%2Fmp4&amp;fexp=9416126%2C9416891%2C9420452%2C9422596%2C9423662%2C9427902%2C9428399&amp;expire=1459599509&amp;ipbits=0&amp;upn=99USaJ1LnkA&amp;dur=30.093&amp;pl=48&amp;lmt=1459568922521937&amp;signature=63FE6D047E895678BAD75266A901C5ABA672A189.0ABBCAA69A9C69003ED38AC11CC08BBF237BB1B3&amp;itag=22&amp;source=youtube&amp;ip=2604:a880:1:20::1ff:1&amp;ratebypass=yes&amp;id=o-AJMIxtvMFBps0IkCDE5t76_cGObBwaTk_xoexDWKt2c0&amp;sver=3&amp;cms_redirect=yes&amp;mm=31&amp;mn=sn-n4v7kne7&amp;ms=au&amp;mt=1459577754&amp;mv=m&amp;nh=IgpwcjAxLnBhbzAzKgkxMjcuMC4wLjE&amp;utmg=ytap1&amp;title=New%20TV%20Ad:%20%22Nose%22" rel="nofollow">http://r12---sn-n4v7kne7.c.docs.google.com/videoplayback?sparams=dur,expire,id,initcwndbps,ip,ipbits,itag,lmt,mime,mm,mn,ms,mv,nh,pl,ratebypass,source,upn&amp;key=cms1&amp;mime=video%2Fmp4&amp;fexp=9416126%2C9416891%2C9420452%2C9422596%2C9423662%2C9427902%2C9428399&amp;expire=1459599509&amp;ipbits=0&amp;upn=99USaJ1LnkA&amp;dur=30.093&amp;pl=48&amp;lmt=1459568922521937&amp;signature=63FE6D047E895678BAD75266A901C5ABA672A189.0ABBCAA69A9C69003ED38AC11CC08BBF237BB1B3&amp;itag=22&amp;source=youtube&amp;ip=2604:a880:1:20::1ff:1&amp;ratebypass=yes&amp;id=o-AJMIxtvMFBps0IkCDE5t76_cGObBwaTk_xoexDWKt2c0&amp;sver=3&amp;cms_redirect=yes&amp;mm=31&amp;mn=sn-n4v7kne7&amp;ms=au&amp;mt=1459577754&amp;mv=m&amp;nh=IgpwcjAxLnBhbzAzKgkxMjcuMC4wLjE&amp;utmg=ytap1&amp;title=New%20TV%20Ad:%20%22Nose%22</a></p>
  
  <p>How can I get this direct link with youtube api v3 or any other.</p>