I do something like this for my old game consoles, except that I pipe them trough an old analog video capture card that supports 240p60 and use the video processing module in Retroarch to do the capture with minimal lag. After adding some fancy CRT shaders and other image adjustment carefully tailored for this, the image comes out looking great! I sometimes toggle the shaders off and wince at the "raw" digital capture. I actually bought this capture card back in 2008 for this purpose but detested using it until around 2018 when I started using it in conjunction with retroarch and CRT shaders.

For that period it even shaped my perception that analog video and specially n64 graphics were always bad, but all that was vindicated by those shaders, it really does make a big difference, and made me find a new appreciation for n64 graphics in particular.

There is some internet misconception that the inherently "blurry" output of an n64 is bad (And sure, some games are just ugly/bad from an artistic standpoint), but it's actually the smoothest image any analog console will ever produce when hooked up to a proper CRT or CRT shader, and it's consistent across all games because of "forced" high quality AA in all games. Even the next generation of consoles seldomly used AA.