Video view is not visible when using Crosswalk

After adding Crosswalk to my project when I made a call a java.lang.ClassCastException was thrown. To solve this issue I replaced the WebView casts to XWalkCordovaView and also changed the _videoParams type from Webview.LayoutParam to FrameLayout.LayoutParam, but the video view is not visible. I tested setting a blue background to _videoView to check whether it is being added to the web view or not, and in fact it is being added correctly to the webview, because when a made a call a blue rectangle appears in the video view place. The thing is that the video is not being shown.