_renderPlayControl(){
    if (this.state.videoPaused){
      return (
          <ViroButton
              position={[0,0,-2]}
              scale={[1, 1, 1]}
              width={buttonSize}
              height={buttonSize}
              source={require("./res/play.png")}
              hoverSource={require("./res/play_hover.png")}
              clickSource={require("./res/play_hover.png")}
              transformBehaviors={["billboard"]}
              onClick={this._togglePauseVideo}/>
      );
    } else {
      return (
          <ViroButton
              position={[0,0,-2]}
              scale={[1, 1, 1]}
              width={buttonSize}
              height={buttonSize}
              source={require("./res/pause.png")}
              hoverSource={require("./res/pause_hover.png")}
              clickSource={require("./res/pause_hover.png")}
              transformBehaviors={["billboard"]}
              onClick={this._togglePauseVideo}/>
      );
    }
  }
Renders either the play or pause icon depending on video state.