Movies in FileMaker are stored as references.
This can be done. You may have to enable the "optimize for interactive content" option on the data tab first.
There is also a bug associated with this feature.
For More Information see: FM12 container video full screen aspect ratio on mac
This is one of many acknowledged bugs that can be found in the Known Bug List thread here in the Report an Issue section of the forum.
It can also be downloaded as a database file from: http://www.4shared.com/file/8orL8apk/FMP_Bugs.html