pause method
Implementation
Future<bool> pause() async {
if (videoStatus == VideoStatus.PAUSE) return true;
if (videoStatus != VideoStatus.PLAY) return false;
var result = await app_player_channel.invokeMethod(
"app_player_pause", this.textureId);
if (result == true) {
this.videoStatus = VideoStatus.PAUSE;
}
return result;
}