No, you can't use BJT transistor as a switch,
I've done it with the simple Radio Shack NPN transistors, so I think you are floating some BS.
You can test by putting an NPN transistor in the video signal line from the video source with the signal inputting the collector and exiting the emitter to the input of the video device (tv, capture card, etc). Video ground wire connected as usual between the video source and video use device. Connect a 10k resistor to the transistor base, then connect a 9v battery negative to the transistor emitter and the battery positive to the resistor supplying the base. Connect, video passes, disconnect and video stops.