It seems that this conversion is possible and is done for the purposes of transforming motion data from .bvh files (Biovision Hierarchy Animation) to a common AVI video so it can be played back in a multitude of media players. We know that this can be done using 3D Studio Max, but perhaps there exist more choices for this particular conversion.
Convert Biovision Hierarchy Animation file to Audio Video Interleave movie.
We found one software available in the database for this conversion.
Microsoft Windows software - convert bvh to avi on Windows
A widely-used 3D animation application from Autodesk
Convert from bvh file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.