You can still have native views that appear over the WebView for certain tasks. I think you can also provide your own rendering context for <canvas> elements, s

You can still have native views that appear over the WebView for certain tasks. I think you can also provide your own rendering context for <canvas> elements, so you could roll your own <video> element for showing the current camera view. Either way, you can still have full native camera control without having a 100% native app.