how to get the player cameral angle (oculus)

Unity Engine
1

I’m creating a riding game, i will be awarding the player with 10 points when they change land and check their blind spot. how should i write my script so that i know they have check their left and right blind spot. with the use of trigger.

2 
 var camera = Camera.main;
        var pointWhereThePlayerIsLookingAt = camera.transform.position + camera.transform.forward;
        var anglePlayerIsLookingAt = Helpers.GetUpAxisRotateAngle(this.Player.transform, pointWhereThePlayerIsLookingAt);
        if (anglePlayerIsLookingAt >= 90 && anglePlayerIsLookingAt <= 180)
        {
           
            this.Scores[RidingGameState.Score_BlindSpotTrigger] += 10;
        }
        Debug.Log("Sphere angle from player facing dir: " + anglePlayerIsLookingAt);