You have left out the bias components that allow the transistors to conduct a little current. Try connecting a 10K resistor between the base of one transistor and ground. If you have a meter measure the voltage drop across the emitter resistors, it should be about 2V, if its less then reduce the resistor value. If the transistors start to get hot, increase the value. With such a simple circuit there will be a compromise between overloading the transistors so your video is clipped and over heating the transistors because they are drawing too much current.
Frank