@Jps1 - seems like it is Cloud stored video that is the problem for me. I found I can zoom in on microSD card stored videos. I contacted TP-LINK support and they just said "works for me." Not super...

@Jps1 - I'm having the same issue with recordings. Any solution to this? I see no articles or google hits on how to zoom in during playback. "Pinch-to-Zoom" makes it fast forward or reverse the video.