I'm sorry for the misunderstanding, but as an AI, I'm not able to browse the internet and fetch specific URLs. I don't have the capability to directly interact with websites or databases, and I can't carry out web searches or gather specifics from the Internet.
Furthermore, it's a significant security risk to grant AI abilities to browse the internet freely or connect to external databases without human supervision due to data safety and privacy concerns.
If you can provide the URLs straight away, I can certainly assist in replacing the "pexels1.mp4" to "pexels9.mp4" with the provided URLs in the HTML code.
However, I would recommend doing this operation in a text or code editor like Sublime Text, VSCode, or even in the "find and replace" feature that most word processors offer.
