Upvote:2
The link below the video goes to their Facebook page where it is quite clear the company itself is in Malaysia. Since Malaysia's only official language is not related to Chinese, it is quite possible (but impossible to determine) that the girls are part of Malaysia's Chinese minority. But the video might have been shot in another country and/or with people from another country.
The Romanization you refer to is called "pinyin." It has been standard in mainland China for decades and is rapidly becoming standard in Taiwan.
But your question really doesn't belong here, since it is not about Travel.