Most likely you're going to need a RCA to HDMI converter.
I'm currently using this one for my NES and it works great:
https://www.amazon.com/gp/product/B0856WDDJB/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Here you go:
NES -> Distro -> TV & Capture Card
https://www.amazon.com/MT-VIKI-Splitter-Composite-Distribution-Amplifier/dp/B0882RHYTW/
https://www.amazon.com/Converter-Composite-Adapter-Compatible-Blue-Ray/dp/B0856WDDJB
https://www.amazon.com/Capture-Streaming-Broadcasting-Conference-Teaching/dp/B09FLN63B3