Creating Muzzle Flash in Version 2.8?

Hello everyone. So currently I’m trying to add a muzzle flash to one of my scenes. However, with the new UI changes, I am unable to find a way to import video as it was previously done in 2.79. What am I missing?

Also, many of the online YT tutorials on creating muzzle flashed in Blender, are now outdated as they are using the Blender Render engine. How would go about this in cycles?