YouTube and Adsense policies have always been confusing. In such cases take the safer course. Adwords traffic on adsense website is okay if it follows their landing page quality guidelines. But with YouTube videos, Adsense has not defined any kind of policy. Further, it would not help earn any profit. Price to be paid per click is always higher than price we get per click. So net result will be loss which will keep on amplifying with the number of views. So if one wants to get views and make their video famous, one should use adwords and gain views. While using adwords, avoid adsense. Later he can put the ads on!