Video Cropping tool?

I am editing video, but this video is in 720p HD 16:9. I want to crop out the sides of the video so that it is 960x720 rather than 1280x720. The reason I want to do this is so it will fit a monitor I use which is 4:3 aspect ratio. Is there any free safe and legit tools online or downloadable to crop video like that... show more I am editing video, but this video is in 720p HD 16:9. I want to crop out the sides of the video so that it is 960x720 rather than 1280x720. The reason I want to do this is so it will fit a monitor I use which is 4:3 aspect ratio. Is there any free safe and legit tools online or downloadable to crop video like that in? I tried looking for one but i can't figure out what to type in to look for that. Thank you for all your potential answers.
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