NEW YORK — NBC is bringing back Katie Couric to co-host the opening ceremony of the Winter Olympics next month in South Korea, and will live-stream the pomp for the first time.

Couric will work with Mike Tirico, who is replacing Bob Costas as prime-time host of the games, for the Feb. 9 ceremony.

The torch-lighting and parade of nations that begins every Olympics took on greater resonance Wednesday with the announcement that the rival Koreas will form their first unified Olympic team and march together in the ceremony.