The article discusses how to dynamically allocate resources for video transmission over wireless networks. With the fast development of video-compression technology and the wide deployment of wireless networks, there arise the increasing demand for wireless video communication services and many design challenges remain to be overcome. With this, the multiuser cross-layer resource allocation should be according to the changing environments and requirements to improve the overall system performance and ensure individual quality of service over the wireless networks. There have been two aspects with regards to design issues, including the cross layer to the application layer and the multiuser diversity, which explores source and channel heterogeneity for different users.