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VLC player demos real-time AI subtitling for videos
(www.theverge.com)
This is a most excellent place for technology news and articles.
In the *arr suite, bazarr has a plugin called Subgen which you can add and you can set it to generate subtitles on your entire library if you want, or only missing subtitles. The sync is spot on compared to 90% of what Opensubtitles delivers. I sometimes re-gen them with this plugin just because opensubtitles is so constantly out of sync (e.g. highly rated subtitles 4 lines will be at breakneck pace and the next 10 will be super slow and then everything is 3 seconds off)
It isn't in-player but it works. The downside is it is a larger model and takes ~20 minutes to generate a movie length of subtitles.