Quick tip for those who care:
If you own an Nvidia GPU, and are familiar with DLSS technology in gaming, they have (more or less) the same tech for video playback called RTX Video Super Resolution which can be enabled in Nvidia Control Panel. It allows you to upscale and view all videos in 4k and in real time (without having to first render in topaz) with compatible video playback softwares like VLC and Pot Player. The upscale is not as good as Topaz Gaia, but it is still very good. It serves as a good starting point whenever you find yourself wondering whether or not a video could be adequately upscaled in Topaz to an acceptable level of realism.