1. Before LIGO made their discovery of gravitational waves public, the LIGO team worked with SXS, a project with the goal of simulating black holes and other extreme phenomena.
In the process, SXS produced a number of animations. They are fun to watch, but are also based on the best available science and state of the art numerical simulations. The animations are each about a minute at most. To look at these animations, go to one of these links...
2. Keith Riles (One of the LIGO team members) gave two lectures on gravitational waves shortly after the LIGO announcement. Each one is about one hour in length.
"Gravitational Waves - Einstein's Audacious Prediction" (February 13, 2016)
"The Hunt for Gravitational Waves - Was Einstein Right? (February 20, 2016)