Here are very useful articles for getting started with VideoCAD:
"The principles of CCTV design in VideoCAD. Part I. Camera view area"(*.pdf, 860kB)
"The principles of CCTV design in VideoCAD. Part 2. Person detection area, person identification area, license plate reading area"(*.pdf, 1112kB);
"The principles of CCTV design in VideoCAD. Part 3. 3D modeling in VideoCAD"(*.pdf, 1265kB;
"The principles of CCTV design in VideoCAD. Part 4. Illumination and camera sensitivity in CCTV"(*.pdf, 1950kB)