With OBS it's even easier because you can down sample your 2560x1440 desktop to 1920x1080 in real time at record time.

That's how I ended up recording my entire screen in the explanation video.

My main problem is I really don't like using OBS for pre-recorded content since the work flow to record a video is much less efficient than with Camtasia. Also when editing the video, Camtasia really chokes compared to using its format as a source file and you lose out on being able to highlight your cursor.