The clip broadcast on al-Jazeera features a number of armed men, some wearing sunglasses and keffiyahs, or traditional Arab headscarves, who moved off when they realised they were being watched.
The footage emerged after Britain and France said they will deploy attack helicopters over Libya to better pick out pro-Gaddafi forces, further deepening their involvement in the crisis.
Helicopters are more vulnerable to attack from the ground than high-flying warplanes.
Col Muammar Gaddafi denies attacking civilians, saying his forces were obliged to act to contain armed criminal gangs and al Qaeda militants.
He says the NATO intervention is an act of colonial aggression aimed at grabbing Libya's plentiful oil reserves.
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