Есть такое понятие как переменные окружения во Фьюжене
http://www.vfxpedia.com/index.php?title=Environment_Variables
и там есть раздел:
FUSION_DV
Set the FUSION_DV environment variable to 'true" to enable an unsupported feature that provides "view on" and preview support through firewire cameras attached to the computer. Also activates support for saving AVI files with certain DirectShow-only codecs
ставите FUSION_DV в TRUE и будет Вам счастье