使用UIWebView播放服务器上的视频无效

i am trying to play videos and show it's title from firebase using UIWebView. I have 2 view controllers the first one videoVC has collectionView of labels of the videos, when you press on the title it should take you to the second view controller "showVideosVC". the titles can be viewed successfully but the problem i am having is that i get blank UIWebView. i dont know what i am doing wrong or why the videos are not playing here is my collection View class i am trying to play videos and show it's title