I watched the video several times (also the original source for it) and read up on a few of the comments.
Would this turn out to be a genuine object coming closer, my guess would be it's the comet cluster the C's have talked about many times. Initially, it would be seen not as a cluster, they said, but as a single object and it was supposed to be coming in from the south (if memory serves).
Another -less probable- explanation might be: it's the first visible sign of the incoming 'wave' which the C's are 'riding' as Transient Passengers. I'm not sure though whether the 'wave' is a visible 'object' as such - but in the YouTube comments it's said to approach the vicinity of the constellation Leo if I understand correctly. fwiw.