In fact, it's not difficult to convert MOV to WebM or OGV today. I found a solution on disscution.apple.com:
Personally recommend a guide on how to convert between MP4 and OGV which is also fit to encode MOV, MP4, WMV, AVI and more to OGV or decode OGV to MOV, AVI, WMV, WebM and more.
Hope it will help you more or less.