Yes it affected mine. I have backlink from youtube according to alexa. whenever I publish any article, I try to add a video to it ( myself created ). and then add the backlinks to that post. The backlinks is nofollow, but who cares atleast I am getting visitors..
Yes youtube videos effect your pagerank, Post videos on youtube.com and share that video in bookmarking sites and in social media sites like facebook, twitter, google+. Thus there will be huge traffic to your site and since these are from high page rank websites it has some effect on google page rank.
Another good thing to remember is that Youtube is owned by Google so Google searches will always look favorable upon youtube videos in the general sense. You can do entire searches on Google strictly dedicated to videos so having a video that ranks high on this search page is also huge benefit in and of its own right.
I don't think it affect for page rank. I do that for getting direct traffic. Not ever found any effect on PR.
I think you tube is platform for marketing your product. Form you tube you may get a lot of visitor at your site. It will increase your page rank and also increase your alexa.
If it doesn't affect your pagerank doesn't mean you shouldn't do it. Youtube is a great source of traffic. however I think it does affect the ranking.
Youtube video can be helpful indirectly in ranking position. As through the video promotion on youtube one can get attention, and by getting attention one can drive those visitors to own site. And thus indirectly site can get traffic from youtube and as traffic raise then site can get better search ranking position.
Youtube Videos helps alot in ranking the page.Because by videos the viewer can better understand the site.
In times video will affect your page rank. But who cares if you are getting lots of traffic and making money. It is own by Goggle for a reason.