Video web presenter

A video web presenter, video spokesperson or virtual host, is an online virtual presenter who is superimposed onto a website and who delivers a direct message to the website visitors. To avoid confusion, the terminology "video web presenter" is the easier nomenclature.
Overview.
A video web presenter can be full body, half body or head and shoulders silhouette of an actor delivered against the backdrop of a static website. A good video web presenter should be sizeable and moveable, and can incorporate various effects, such as appearing to walk onto the site.
The web presenter technology involves using a green screen backdrop when filming so that the video can be edited using Chroma key compositing. This allows the video to appear as a transparent overlay onto any website using a single line of HTML (and often javascript) code. A green screen is used as the image sensors in digital video cameras are more sensitive to green than any other colour.
A video web presenter is a stock in trade marketing tool of up to the minute websites, and is considered to greatly enhance a web visitor's interactive experience, increasing website browsing time, and consequently exposure to your brand/product, and therefore ultimately sales.
Principles.
The key principles of a web presenter are: