Sadly I'm not able to give You a link to the video, I have seen it on tv some time ago.
Two soldiers were running through the field and each on of them held it from one side. It looked kind of like dark-coloured hula hop-like thing. I'm aware of how it may sounds, but this thing seemed to be important equipment. So do You have by any chance an idea what could be this thing?
edit: Crappy-looking sketch: http://i.imgur.com/ngYpTqj.jpg
It's a roll of Concertina Wire. Effective barrier against infantry and vehicles.
Basically it's barbed wire rolled in a circle to make it hard to ignore and easier to set up. 3 of them in a pyramid shape are the standard configuration.
Source: I've set up plenty of this
Additional Source: http://en.wikipedia.org/wiki/Concertina_wire
Some more details would help. Was it smooth or did it have a rough shape? How thin was the tube compared to the hole? Did it look heavy or just unwieldy? Was it one solid thing or a composite? Did it have handles mounted? How big was it in relation to the soldiers? Where were the soldiers, near trenches or somewhere else? Were they under fire or just hasty?
Most obvious in WW1 is a roll of (barbed) wire.
