Prerequisites: a Google Cloud Platform project with the Video Intelligence API and Vision API both enabled. The APIs are the interfaces between you / your applications and the Cloud services. There are multiple options to access the APIs:
One option is to install the Cloud SDK on your machine and initializing it - linking it with your project.
Afterwards, the Cloud SDK, which
is a set of tools for Cloud Platform. It contains gcloud, gsutil, and bq, which you can use to access Google Compute Engine, Google Cloud Storage, Google BigQuery, and other products and services from the command-line. You can run these tools interactively or in your automated scripts.
has the proper (command-line) tools to access the Google Cloud Vision and the Google Cloud Video Intelligence products.
Another option is to make direct calls to the APIs, i.e. via the REST endpoints. You can read about Cloud Vision APIs here, Video Intelligence APIs here and test them via Google's API Explorer.