Is there ref doc for API v2?
https://movian.tv/projects/movian/wiki/JSAPIREF, this is only for version 1. Is there a same ref for version 2? or they are same?
No, not at the moment :-(
One tiny bit of help might be to have a look at the youtube plugin https://github.com/andoma/movian-plugin-youtube
It's written well aligned with the V2 API.