Is there a video editor/ app that will allow user to crop the viewable area the same way a photo is cropped?

Sorry if I posted in the wrong area! I hope it's clear what I am looking for- I've tried searching but results turn up what I call "trimming" instead of cropping. The reason I'd like to find a tool that can crop a video's frame area is so that I can post videos from our home surveillance camera of car thieves, mail thieves & other suspicious activity caught on camera and make it focus in on the relevant part without showing my whole front yard, making it obvious where I live. The camera itself is an outdoor wired camera that records to (I believe) DVR but does not have a zoom feature. When I playback video, I can zoom in if I watch on my iphone but not the macbook. I prefer something I could use on the macbook. I have no idea if this is even possible but it sure would make me happy if it is!

I should probably mention that I have never edited video or used any programs or software so I would need some kind of video tutorial (or a savvy 6th grader) to teach me how to use it. 😊

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