That video is of a Q30, not a QX30. That's also in Asia somewhere, probably China. None of the QX30's come with a power liftgate. Though, the GLA 250 does have a power liftgate as well as the Q30 in that video (which has the box in the trunk, making it seem like there might be a kit out there).
Translating the comments on the YouTube video, the commentor says "How much does that system cost?" and the response, is something like "Kang Bao 24000 completed" which may refer to the location in China and 24000 converted to USD is around $3500. I'm guessing someone installed it for them, that wasn't a self-install. Not sure what the "line
[email protected]" is, could refer to the company that did the installation. I found this image on Facebook
https://scontent-ort2-2.xx.fbcdn.ne...=e5072bec6fbd53b9f5cef05a91cb3898&oe=59CAC920 that has "LINE @ack3899" in it. There's this video of a power liftgate on another car, too, also referencing "line id ack 3899"
https://m.facebook.com/story.php?story_fbid=1702072006705825&id=1533900786856282&_rdr
Good luck. Let us know if you find anything.