The fighting comes as UN envoy Staffan de Mistura is trying to broker a truce for war-ravaged Aleppo, Syria's largest city.
On Tuesday he said in New York that Syrian President Bashar Assad has expressed willingness to suspend bombing of Aleppo for six weeks.
The Britain-based Syrian Observatory for Human Rights and Aleppo-based activist Ahmad Hamed said the troops were seized in the village of Ratyan after it was retaken by the rebels on Wednesday. More than 170 fighters have been killed from both sides in the clashes, according to the Observatory.
The video appeared genuine and corresponded to other Associated Press reporting of the capture and fighting in the area north of Aleppo.
The Observatory said rebels also recaptured the village of Hardatnein Thursday, two days after it was taken by government forces. The Observatory and Hamed said intense clashes are taking place outside a third village, Bashkoy, which was also taken by the government on Tuesday.