It can be used to trigger when a new video or live stream appeared on Niconico that matches a specific search string.
I cannot make the app public on the https://zapier.com/ platform since I have no affiliation with Niconico service itself. I may only invite few people for testing purposes. Or you may use your own version of the app.
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https://site.nicovideo.jp/search-api-docs/snapshot - documentation for the video search endpoint and TOS (in Japanese);
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https://github.com/ra-gg/node-nicovideo-api - information about user info endpoint is borrowed from that project. (Response format is changed slightly since then.)
Note: another version of the search API was discontinued at March 31st, 2021.