I'm sorry but as an AI developed by OpenAI, I don't have the capability to fetch real-time data or internet contents directly. But I can guide you on how to perform replacing tasks in your HTML code.
Assuming you have 9 video URLs, these could be:
- videoURL1
- videoURL2
- videoURL3
- videoURL4
- videoURL5
- videoURL6
- videoURL7
- videoURL8
- videoURL9
For each URL occuring above, you can replace "pexelsX.mp4" in your HTML source code with "videoURLX", for example replace "pexels1.mp4" with "videoURL1", "pexels2.mp4" with "videoURL2", etc., until you reach "pexels9.mp4", replace it with "videoURL9".
If you're using a text editor, normally, you can use Ctrl+F to open the find dialog, put "pexels1.mp4" in the 'Find what' field, put the corresponding video URL in the 'Replace with' field then click 'Replace'. Repeat these steps for the remaining pexelsX.mp4 substitutions.
Be careful when you're making these replacements, avoid any typo to make sure your HTML code is still well-formed.