On iCloud.com, you can recover files deleted from both iCloud Drive and other apps within the last 30 days, whether you deleted them on iCloud.com or another device that has iCloud Drive turned on. Go to check if you have deleted them over in 30 days. If did, you can recover them easily with the following steps:
1. Open the Photos app on your iCloud on any device.
2. Find Albums at the bottom of the screen.
3. Go to the Recently Deleted album.
4. Tap on Select at the top right of the screen.
5. Select all of the photos that you want to recover.
6. Tap on Recover at the bottom right of the screen.
7. Confirm that you want to Recover Photos.
If you deleted videos from the iPhone 30 days ago, you can try to utilize third-party data recovery software to scan for them. Find the top-recommended one on Google or Safari to complete this data recovery process. Note that how many files can be recovered depends on whether you have overwritten the videos. Good luck!