YES, if you want to use another user's content from YouTube, you should seek their permission, especially if you plan to use it in a way that goes beyond what is allowed under YouTube's terms of service or applicable copyright laws. Here's how you can request permission:
Contact the Content Creator: Reach out to the content creator directly through YouTube's messaging system or any other contact information they provide in their video description or about section.
Explain Your Intentions: Clearly state how you intend to use their content and why you need permission. Be specific about how much of their content you plan to use and for what purpose (e.g., in your video, for a remix, etc.).
Request Permission: Ask for their explicit permission to use their content in your project. Politely inquire if they are willing to grant you the necessary rights for your intended use.
Credit and Attribution: Discuss how you will credit them in your video, if required, and any terms or conditions they may have for attribution.
Obtain Written Consent: If they agree, it's a good practice to have written documentation of their permission, such as an email or message exchange, in case any questions or issues arise in the future.