Depending on what type of computer you have there are a few options. Apple/Mac's come with iMovie and you should be able to do it. Windows comes with Movie Maker (Windows 10 you have to download it) but that's what I have used in the past. You can trim your videos, splice them together to make a longer video, etc.
I've also got a PowerDirector that I'm now using for editing my filmed hunts and will probably use that for my TC vids. Hope that helps.
Actually I use movie maker for both my trail cam videos and also my action camera videos.... a lot of times i'll even put the two videos together since I usually where my action cams out while checking trail cams.
As pops mentioned, Windows Movie Maker, IMovie will basically do what you want to accomplish...
I use PowerDirector and VideoStudio for video editing and I think you'd be further ahead with one of these products. You can crop and export pretty quick with them.
I have licensed (legit) version of PD 14 Ultimate, that I'm looking to get rid of if your interested.