You have several ways to provide your content with notifications that you are using third party material. However, merely mentioning the word 'fair use' is not sufficient to also comply with the rules of U.S. law on the right to use copyrighted material under 'fair use'.
Therefore, before you decide to use third party content covered by the 'fair use' concept on your own video platform, we recommend that you first investigate the consequences of that decision. A lawyer may be able to tell you what is and what is not allowed.