Question regarding cropping in OBS studio

[rocknrolla115]

So i have recently started using OBS studio on my PC to record my monitor(s) and this works great as long as i capture the whole screen/monitor area. But then i tried something else and i used the crop function in OBS to cature only a certain area on the screen. For example, an application window but here`s the problem i see with this crop function. When i start recording the screen, it still captures the entire height & width of the monitor and therefore the video ends up with lots of black around the cropped area.

So my question is, can i crop the output somehow in OBS and only render the cropped area when i record the video?

All of my 3 LG monitors runs in 2160x3840 resolution and that`s also what i have the video output set to in OBS video settings.

If there is no way to crop the output in OBS, can i use some other software to do this afterwards?

I will attach a screenshot showing how my recorded video looks like after cropping it and as you can see, lots of black above the cropped area.