You’ll first likely need to transfer your camera recordings to a PC or Mac computer- using whatever method is most appropriate.
Once the material has been transferred to your computer, you’ll be able to use either the iTunes application (PC) or iTunes/Finder (Mac - as appropriate for the installed version of macOS) to transfer your material to the iPad over a USB connection.
There are many video editing Apps for iPad of varying complexity. These Apps can be found in the Apple App Store. Apple themselves offer iMovie; one of the better third party Apps is LumaFusion.
Apple iMovie:
https://apps.apple.com/gb/app/imovie/id377298193
LumaFusion:
https://apps.apple.com/gb/app/lumafusion/id1062022008
As you’ll need to use a PC or Mac to transfer your material, you might find the computer (with a larger screen and more potentially more powerful CPU) to be more suited to video editing.