Generate annotated videos using BEVFormer model for a selected scene.

Args:
body (BevFormerRequest): Input request containing scene_id and optional config
Example scene_id values include:
'scene-0103': Yield to left-turning vehicle at Boston intersection
'scene-0916': Navigate a bus stop parking lot in Singapore
'scene-1073': Left turn at a busy nighttime intersection in Singapore
'scene-0061': Follow vehicle into construction zone in Singapore

Returns:
BevFormerResponse: Response containing both camera and BEV videos
Error: When processing fails, returns appropriate error response