Actually the market, from the pros right on down, is pretty saturated these days so you have to do something a bit special, or be something a bit special, if you want to fund more than the odd chocolate bar.
Back on topic as it were then as others more or less said it is possible but it is not easy, especially if you do not have gear or a skillset, and quite possibly a niche*, you can otherwise exploit.
*other than perhaps the art/technique of video making I have not really seen much that is so sewn up that someone else can not walk in there are take a lot of the audience. Or if you prefer see why Youtube quality now refers to the quality of the end result (editing, camerawork, scripts or lack thereof) rather than the nasty low res, high compression flv stuff we once saw.