I'm using "Video" theme from mythemeshop.com. I must say it is one of the best themes available in the market if you are looking for a video blog based on Youtube videos. It is highly responsive and looks really good in your PC, mobile and tablet.
I could install theme without any problems and the dummy data is really helpful to understand the theme.
I needed few customization to my personal taste and the support I got was excellent. You can expect a response to your questions with few hours if not immediate for sure.
Thank you Mythemeshop and you guys are awesome.