The court was shown (冇 the？) video footage of the robbery.

你理解錯了。

我相信你示下那一句中的 video footage 是第一次提及，在前文沒提過，所以是 indefinite ，本來應該用 a 或 an (不是 the) ，不過，不可數或複數名詞則不用任何 article ，而 Footage 正是不可數名詞，因此不加任何 article 。

但如果你後來又提到同一個 footage ，那你就要用作為 definite article 的 the 了，這與單數可數名詞一樣。

請看以下例子：

The court was shown video footage of the robbery. The video footage was taken by a camera in the bank.

The court was shown a picture of the suspect. The picture was taken by a camera in the bank.


There are rules that you need to follow when you write your report. You can find the rules in the syllabus.

There is a rule that you need to follow when you write your report. You can find the rule in the syllabus.

This might sounds better:
Video footage of the robbery was shown at the court.