Video Widget stops audio from playing

### Problem description
Before the `Video` widget was created, I had music playing in a third-party app, but then it stopped. I understand that it's Android itself doing this, but can I somehow control it?
I know there is a method in the native `setAudioFocusRequest()`. Can you do something similar?

### Expected behavior
I would like to be able to indicate whether the third-party player needs to be stopped or not.

### Environment
- Tabris.js version: 3.0.1
- Device: Xiaomi Redmi 5 Plus
- OS: Android 8.0.1

### Code snippet
```typescript
new Video({ url: 'urlhere', width: 100, height: 100, controlsVisible: false })
.appendTo(contentView);
```