I tried again, after seeing your post.
A running list of new joiners fills the left side of the screen, a bunch of hearts fills the right third of the screen.
Just a narrow view through the center.
Oh, those are not pop-ups. The video is a cell phone video. The hearts and all that other stuff is people commenting on the video on the website. Similar to YouTube.
I just saw it for the first time.
Same here . Floating hearts & comments posting...fyi