As long as you have permission to use third party copyrighted work on your own video platform, you can absolutely do so. This permission is often referred to as a 'license'. If you own such a license, you may use the content on your own video platform.
If you use (video) material that is not protected by a license, but by the so-called 'fair use' policy, you do not need explicit permission from the copyright holder to use this material on your own video platform. More information on fair use can be found in this section of the TradeCast Support database.