You might also want to add all the urls of that channel to the whitelist. You can add the channel's link to the whitelist for the users to view the channel, but when they click on any video on the channel, it will take them to a different URL, this is why you will need to add each of those URL's to the whitelist as well.
An article describing how to achieve this goal with the experimental MineMeld miner at https://github.com/PaloAltoNetworks/youtube-miner is available at Filtering YouTube videos to only approved playlists
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