Videos Appearing as Black Boxes in UIImage Snapshots of WKWebView - swift

Question

I am captruing the content of WKWebView into a UIImage via its CALayer by using the following extenstion to UIImage:
extension UIImage {
class func imageFromLayer(layer: CALayer) -> UIImage {
UIGraphicsBeginImageContextWithOptions(layer.bounds.size, layer.isOpaque, 0.0)
layer.render(in: UIGraphicsGetCurrentContext()!)
let img = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return img!
}
}
When I render the captured image to a UIImageView, I see everything from the web view in the image view; everything, except videos, whose content instead appears as a black box. I encounter the same problem if I use WKWebView's takeSnapshot function or the drawHierarchy function of the UIView class to capture UIImage of the web view. Does anyone know why videos are displayed as black boxes and how one can fix this?
Update 1: Additionally, all GIFs in Google Images are frozen until clicked. A GIF can be unfrozen by clicking on it, at which point it gets resized to take up the whole screen and starts looping.
Update 2: I have read that the recording software OBS sometimes experiences the same problem with capturing videos when the browser that it is capturing uses hardware acceleration. I also read that WKWebView uses hardware acceleration. Is there a way to disable hardware acceleration in WKWebView to try this out? Alternatively, does UIWebView use hardware acceleration?
Update 3: There is another post that reports a similar issue. The poster reports that all GPU rendered content appears black in his screenshots and he believes that hardware acceleration is causing the issue.
Update 4: By using Xcode's "Quick Look" feature I have observed that the layer that is passed to imageFromLayer does not contain the videos (i.e. videos are already represents as black boxes in the passed in layer). This makes me think that WKWebView does not render videos to the same layer as it renders its other content. It also makes me think that if I could access this hypothetical video layer I would be able to combine the two snapshots to form a snapshot of the entire web view.
Update 5: I tried modifying my imageFromLayer function to take a UIView instead of a CALayer so that I could pass WKWebView into it directly. The modified version is shown below, but it did not solve the issue of videos not being displayed. Nevertheless, through the use of Xcode's "Quick Look" feature I was able to observe that the videos are already missing in the UIView of the passed in WKWebView object.
class func createImage(view: UIView) -> UIImage {
UIGraphicsBeginImageContextWithOptions(view.frame.size, view.isOpaque, 0.0)
view.drawHierarchy(in: view.bounds, afterScreenUpdates: true)
let rasterizedView = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
return rasterizedView
}
Update 6: Trying to capture the web view via the UIWindow that contains it also results in videos not being captured. I used the below code (note that keyWindow is deprecated) and Xcode's Quick Look feature to test this idea.
let window = UIApplication.shared.keyWindow
let windowLayer = window!.layer