IEnumerator RenderAtEndOfFrame()
    {
        yield return new WaitForEndOfFrame();
        _uiRenderer.PostRender();

         Texture2D tex= new Texture2D(100, 100, TextureFormat.ARGB32, false);

        // Read screen contents into the texture
        tex.ReadPixels(new UnityEngine.Rect(100, 100, 100, 100), 0, 0);
        tex.Apply();

       //Convert the texture to a PNG
        byte[] bytes = tex.EncodeToPNG();
       // Write the PNG to check if capture works fine
        System.IO.File.WriteAllBytes(Application.persistentDataPath + "test.png", bytes);

       //Assign null to the variables to avoid memory exception
        tex= null;
        bytes = null;
}