Added Video Transcription sample code. (#30)

* Added Video Transcription sample code.

* Code cleanup after running prettier.

* Removed the ^

Author: happyhuman

packages/google-cloud-videointelligence/package.json

@@ -73,6 +73,6 @@
     "mocha": "^5.0.0",
     "nyc": "^11.2.1",
     "power-assert": "^1.4.4",
-    "prettier": "^1.8.1"
+    "prettier": "^1.11.1"
   }
 }