Dear developer,
Please try the following code:
AndroidJavaObject context = new AndroidJavaClass("com.unity3d.player.UnityPlayer").GetStatic<AndroidJavaObject>
("currentActivity");
AndroidJavaObject intent = new AndroidJavaObject("android.content.Intent");
intent.Call<AndroidJavaObject>
("setAction", "pvr.intent.action.CAPTURE");
intent.Call<AndroidJavaObject>
("setPackage", "com.pvr.shortcut");
intent.Call<AndroidJavaObject>
("putExtra", "action_type", 2);
context.Call<AndroidJavaObject>
("startService", intent);