The problem with the chinese language video is that they are probably telling you important posture tips, instructions and ways to prevent injury. My suggestion? Take the DVD back, or sell it to a used video store/ebay.
The best DVDs for beginners are the "Living Arts" series. Go to www.amazon.com
and search for: living arts yoga.
Follow the postures that the instructor does, but you will not have the full extension they do. If you need to bend your knees, or modify the pose that is okay. The more you do yoga, the more flexible that you will become. I have enjoyed yoga for about 2 years. It has really helped me with my other exercise activities and with some joint conditions as well.