As far as I know, the only way to make a custom video request is to navigate to trips history and find where along the breadcrumb trail the time period you want to request.
However, we had a customer who was not aware of their Go Device not tracking for several weeks and therefore, no breadcrumb trail exists.
Luckily for this customer, the camera was recording and we were able to obtain the footage from the SD card but Geotab should make a feature in their add-in that someone can request raw files off of the SD card without the trips history bread crumb trail.