Yeah unfortunately there is nothing to dynamically control the wix video player yet which is the one able to take channels.
What you can do instead is
1, have a unique player for all channels and decide which to show depending on the dynamic page(will cost considerable load time addition as they are all technically there loading)
2. Use a database with links to uploaded videos and use that to determine what video to show in a single video player.
Otherwise im pretty sure its going to come that you can control channels etc in the video player. but no clue when it would arrive.