Kampoon Monster contributed the Wolf scene to the Gooseberry trailer. In this new article on the Gooseberry blog, they talk about adding the sparks and smoke VFX using the Blender compositor.
Kampoong Monster writes:
In this article we’ll explain how easy to put effects into the shot for this case. We use VSE Mask modifier to mask part of Michel body ( the character ). The idea is to put some sparks behind Michel, and another in front of him.