The image below is an example of an aerial 3D documentation done with an open source UAV and Python Photogrammetry ToolboX...
|Aerial documentation with a KKopter and ArcheOS (PPT)|
|Test with Victor Jansa's pictures (done with PPT)|
In order to answer the second question, I can say that, facing our experience, it is possible to reconstruct 3D models from videos (and I guess this is one of the aims of SfM itself). We did some tests about this topic, getting acceptable result (at least regarding our primary target, which was to have a fast 3D object for further modeling operations). As an example, I can report one of the last post of Cicero Moraes, who used SfM from a youtube clip to get a 3D skull for forensic facial reconstruction aims. The image below is taken from Cicero's photo album:
|3D skull obtained with SfM techniques from a movie|
|From "La foresta sommersa del Lago di Tovel" (T. Camagna, A. Forti)|
... and here you can see the result:
I hope this post was useful. Soon, when the season will allow us to start diving again, we will go on with tests and experiment related with underwater archeology. I hope to write soon some new report about it.