VSR doesn't activate on Capture Card content
This may be intentional but worth a try. I have a PS5 connected to a capture card, outputting at 1080p60 SDR. On normal videos on HPC-BE, it works a treat. But if I play the capture card's output via File -> Open Device... VSR doesn't seem to activate. "Nvidia-VSR-Requested" still shows up, too.
Could be using a format that VSR doesn't support, maybe try the P010 guide at https://github.com/emoose/VideoRenderer/issues/1#issuecomment-1450964365 for converting things over to NV12 and see if that helps at all (make sure to uncheck everything except NV12, that should make it convert everything to the format VSR supports)
You need to change hardware decoder from Native to Copyback.