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Please navigate to Dashboard > Forums > Settings > Addons > Embeds admin page and find all embedding options which allows wpForo Embeds. Even the YouTube embedding function is provided by this addon. wpForo doesn't have such feature by default. Unless you've hacked or added some code. wpForo doesn't have Youtube Share URL to Youtube player converter.
Besides all video hosting embedding options wpForo enables oEmbed feature which adds hundreds of other audio, video, image and other widget embedding functions.