I don't know about the laws in China, but here, if the what you're shooting (photo or video) is legally deemed newsworthy, publishing it is legal, and I imaging that any video showing up on YouTube would legally be considered "publishing".

If it isn't something considered newsworthy, and the person or persons can be identified, then it is illegal to publish without a signed release form from all parties concerned.

If the person or persons can't be identified, and you're shooting in a public place, then it's legal to publish.

If you shoot something while on private property, then you must have a signed release from the owner of the property to publish. Actually, you're supposed to get permission to shoot there in the first place.

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If there is righteousness in the heart, There will be beauty in the character. If there is beauty in the character, There will be harmony in the home. If there is harmony in the home, There will be order in the nation. If there is order in the nation, There will be peace in the world. So let it be.

In the US, the issue is not whether a picture or video can be taken (in a public or private place) but whether the subjects likeness can be "published" without the subject's consent. Liability would depend upon how and why the likeness was published. As part of a news article has different requirements than for entertainment or some profit making purpose. Additionally, while YouTube's liability may be limited, the liability of the person posting (publishing) the video is a different issue. In that respect, much would depend upon the laws in China.