Youtube is the most popular video site out in the wild. Many proxies support youtube in desktop browsers but they are unplayable in mobile devises. Here are the the proxies that unblock access to youtube on mobile. You can actually play the video without the need for flash player.
US Proxy 1 UK Proxy 2 Europe Proxy 3 Indian Proxy 4 Malaysia Proxy 5 Proxy 6 Proxy 7 Proxy 8 Proxy 9