I think it’s necessary to show the video. A verbal description is not enough. A video shows a lot more than just “deeds”, you can see faces/expressions and there’s so much that can’t be portrayed just through words alone. If I were a prosecution lawyer, I would not feel comfortable relying on a verbal description alone because that would require jurors to visualize the crime. If the crime is quite heinous, I would doubt their ability to do so.
Would you rather a jury come to a verdict based on the actual, real video evidence of a crime, or would you rather they base it on their visualizations in their head that they formed from reading a description? It’s like secondhand knowledge.
That being said, someone who is especially squeamish/extremely averse to gore should bee excused from participating in a upcoming murder trial where very gory video evidence must be viewed.
Personally, I would view the video and it would bother me as it would anyone, but it wouldn’t be torture.