@Amit_Sharma In the playground you shared it looks like multiple scenes are created at the same time which is not recommended and did you try specifying createDeviceOrientationCamera:false like sharp suggested?
In this webVR example: https://playground.babylonjs.com/#TAFSN0#2
VrHelper is created like
var vrHelper = scene.createDefaultVRExperience({createDeviceOrientationCamera:false});
This should not replace the existing camera so orientation sensor will not be used. Entering WebVR will switch cameras to enable webVR and start using device orientation. Exiting webVR should return back to the starting camera so it should behave as you desire.