No matter what restrictive requirements you express on the video cover, they are not legally binding unless you quote non-existent legal provisions; Or deliberately misinterpret the meaning of legal provisions by splicing, adding or deleting. If this is the case, and it is released to an unspecified object, resulting in adverse consequences, it may be suspected of spreading rumors.

Generally, it is not illegal to just add a "No Watch for Minors" and then attach a video suitable for all ages.