Sound playing but no video

Hi, I just update my old ip7 into iOS15.02 and discovered a serious problem to me, when I tap a video in a web page it plays but no visuals, only sound plays, so I did check both browsers chrome and safari and even Firefox have the same issue, so did some googling found a solution safari, going to safari advance setting > experimental > disable > gpu media” works the problem in safari browser. Now safari is playing contents in web pages. But others are same. Now just moments ago I discovered in the what’s app also if you received a YouTube link it will not play in “Pip” just playing the sound no video. Don’t know where else this problem exists more but I discover in mention areas only, Facebook, YouTube app they play totally fine. This started to happen after I update to newer iOS 15.02 before its works sharp and no error at all Please give me a solution. Thank you