Camcorders that can stream directly to YouTube
The "JVC GY-HM200SPU 4KCAM Compact Handheld Streaming Camcorder" claims... "When equipped with an optional Wi-Fi or 4G LTE high-speed broadband modem, the camcorder can deliver a live video stream directly to USTREAM and YouTube, while simultaneously recording HD video internally to SDHC/SDXC memory cards. "

I believe there are other camcorders in the JVC range, and almost certainly in cameras from other brands that will live-stream to YouTUbe.

https://www.bhphotovideo.com/c/product/1206407-REG/jvc_gy_hm200sp_4kcam_compact_handheld.html