This example shows how to set GoogleStreetViewLoader to load from a google maps URL.
Try https://www.google.com/maps/@51.546483,-0.1293555,29051a,13.1y/data=!3m5!1e1!3m3!1sKGh2_8m7l_ikrgaYrAAFeA!2e0!6shttps:%2F%2Fstreetviewpixels-pa.googleapis.com%2Fv1%2Fthumbnail%3Fpanoid%3DKGh2_8m7l_ikrgaYrAAFeA%26cb_client%3Dsearch.revgeo_and_fetch.gps%26w%3D96%26h%3D64%26yaw%3D45.903923%26pitch%3D0%26thumbfov%3D100