Shortened link
The link you followed has been shortened with is.gd. Shortened links can go anywhere on the Internet so you shouldn't continue if you got the link from a suspicious source e.g. junk email.
The full original link is shown below. Click the link if you'd like to proceed to the destination shown: -
http://r6---sn-4g57kue6.c.youtube.com/videoplayback?app=youtube_gdata&devkey=AX8iKz393pCCMUL6wqrPOZoO88HsQjpE1a8d1GxQnGDm&el=videos&upn=vfT_ZOJL1pA&uaopt=no-save&source=youtube&itag=18&id=2cb5cb76250f593e&ip=0.0.0.0&ipbits=0&expire=1356995629&sparams=id,itag,source,uaopt,upn,ip,ipbits,expire&signature=D4B228DC9107ACED7379D42A017263F50C6B9A0E.C87214BA74C9EB062FDEEF45B9BBD7BE31D54283&key=yta1&ms=tsu&mv=m&mt=1356966782&cms_redirect=yes&redirect_counter=2
Tip: some QR readers fail to read mixed case URLs properly. We recommend using the lower case option or a lower case custom URL with QR codes.