You can use the following link for installing Husky https://github.com/husky/husky
In this repository you will find the files that were used in the video. You will find the following files:
1.) 3D_world.world This is the world file in which you will run your Husky made by me.
2.) Husky_3D_world.launch This is the launch file required for running the 3D_world.world in Gazebo.
3.) Husky_3D.launch This is the file we will be executing and spawning the 3D_world as well as the robot in it.
You will find all other files installed along with the Husky.