Answered
CEP : How to create multicam clip with ExtendScript
It seems like we didn't support create multicam clip with ExtendScript, I'm using CEP ZXP. I also look through UXP but I coudln't find how to create multicam clip.

It seems like we didn't support create multicam clip with ExtendScript, I'm using CEP ZXP. I also look through UXP but I coudln't find how to create multicam clip.

Correct, on both counts.
ExtendScript never provided such a method, and the initial release of UXP extensibility is focused on parity with what was previously available via ExtendScript. We plan to expose such an API, via UXP; no dates available.
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