yeah, it seems like you should be able to. It will very nice to have a variety of quality glass to use. I bought a small camcorder for stock videos recently and have been a bit frustrated with the limitations of that lens. It would be great to have DSLR control over the aperature, focus, focal length etc.
The sound is probably pretty crapy but most stock videos don't have sound anyhow so it should still be OK. I don't even think stockxpert accepts videos with sound.