No, you can't use BJT transistor as a switch,
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).
I didn't say it wouldn't switch video signal on. What I say, there would be significant distortion in the video.
Just one quick question. I'm curious why the resistor is needed on the base.