Here is document: https://document.harutheme.com/circle/Video tutorial: https://www.youtube.com/channel/UCnOxXtfrkgq92wgqJCBi55g/videos?view_as=subscriber
In our theme have a notice that Page Options will override Theme Options. You can understand more about it follow this topic:https://harutheme.com/forums/topic/why-theme-options-doesnt-apply-changes/
You also can add any field to your video follow this topic tutorial: https://harutheme.com/forums/topic/add-new-metabox-circle-single-video-film-actor-director/
Hope this helps!