Can I record light with a camera? If possible, use software to play it at twice the speed. Can the light in the video exceed the speed of light?

This question is very interesting and seems reasonable, but it is impossible. Because you can't record the movement of light.

You can understand it this way, assuming: you really recorded the light, where is the video you see displayed? The screen, right? So why does the screen glow? It is because the subsequent electron flow hits the display screen, causing the color change. So what is the speed of the electron flow? It is the speed of light, which means that even if you really record it, you have nothing to play it back because nothing can go faster than the flow of electrons.

Assume further that even if there is something that can hit the screen, and there is a "light" faster than light flashing on the screen, how do we see it? It is through the absorption of light by the eyes in the real world. What is the fastest in the real world is light! In other words, even if there is this light, the speed you see is still the speed of light, because it reaches your eyes at the speed of light.