1. Bandicam http://www.bandicam.com/
The free version is restricted, but this software streams, allowing recording of long presentations.
2. Allways-On-Top http://www.labnol.org/ , a utility you do not have to instal, which keeps a window on top of other windows. This allows a face to be superimposed on a powerpoint style projection.
3. WebCamVeiwer - I used this to make the video of my talk at IUPAC. The problem is they have an URL at the bottom of the cam.
4. Open Broadcaster: https://obsproject.com/
I do not believe Bandicam has been updated, and it is not free. This software is a bit complicated to learn, but I think it has great potential.