Removing people from my video

That kind of edit is not supported, and the premium package never suggested it was. You will have to use a dedicated video editor for that. Do realise that removing something from a video is not as simple as removing something from a photo. A video is basically 24 or more photos per second, and the people in the video will probably move. That means they will have to be tracked throughout the video clip and then removed from each frame separately. A dedicated video editor may include that (a free video editor probably won't either), but Lightroom is not a dedicated video editor and so it does not.