Uniqlo (in Japan and at least in SF) has a cool checkout method. You drop your clothes into a big bin (I’ve always done it one piece at a time, didn’t think to do all at once) and it adds up all your items. I’ve used this maybe 8 times, 100% accurate so far. Not sure how it works but I guessed RFID and quick Google appears to confirm: https://www.wsj.com/articles/uniqlos-parent-company-bets-big...
The closest thing I've seen in a convenience store, was a fully automated 7-Eleven that I ran across in Taipei last year. It seems to rely on smart shelves[1], rather than just product video recognition. This could work for most types of groceries.
[1] https://www.retail-insight-network.com/news/7-eleven-itri-st...