Adds missing dependency until the video library is fixed.

Author: gguuss

video/cloud-client/pom.xml

@@ -50,6 +50,11 @@
       <artifactId>google-cloud-video-intelligence</artifactId>
       <version>0.20.1-alpha</version>
     </dependency>
+    <dependency>
+      <groupId>com.google.auth</groupId>
+        <artifactId>google-auth-library-credentials</artifactId>
+      <version>0.6.1</version>
+    </dependency>
     <dependency>
       <groupId>com.google.oauth-client</groupId>
       <artifactId>google-oauth-client-jetty</artifactId>