Different countries have different rules about when it’s okay to use material without the copyright owner’s permission. For example, in the United States, works of commentary, criticism, research, teaching, or news reporting might be considered fair use. Some other countries have a similar idea called fair dealing that may work differently.
Courts analyze potential fair uses according to the facts of each specific case. You’ll probably want to get legal advice from an expert before uploading videos that contain copyright-protected material.