It should be EMBED_NOT_SUPPORTED, not ELEMENT_NOT_SUPPORTED. You have to make iframe from video div like on original page. "If the unsupported widget has an iFrame version, make it into an <iframe>. If you do that, the IV page will not be generated due to unsupported content, but things will work out of the box if and when we support that widget."
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"If the unsupported widget has an iFrame version, make it into an <iframe>. If you do that, the IV page will not be generated due to unsupported content, but things will work out of the box if and when we support that widget."