well I think that it depends on ur WAN connection speed and what u need to do exaclty. but most commonly only ur voice (and time sensitive data) is placed in the PQ. sure video is time sensitive but it is not as important as voice.
I think you have to refere to a design guide for this. try SRND
The criterion for video conferencing traffic to be placed into a priority queue is a DSCP value of 34, or a PHB value of AF41. However, due to the larger packet sizes of video traffic, these packets should be placed in the priority queue only on WAN links that are faster than 768 Kbps. Link speeds below this value require packet fragmentation, but packets placed in the priority queue are not fragmented, thus smaller voice packets could be queued behind larger video packets. For links speeds of 768 Kbps or lower, video conferencing traffic should be placed in a separate class-based weighted fair queue (CBWFQ).
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