Hungarian prosecutors say they have opened a criminal investigation against a camerawoman who was filmed kicking and tripping asylum seekers who were fleeing border police.

In the footage, which sparked global outrage, Petra Laszlo can be seen tripping up a man sprinting with a child in his arms, and kicking another running child near the town of Roszke, close to the border with Serbia.

It later emerged that Ms Laszlo, who was fired over her actions, had been working for N1TV, an internet-based television station close to Hungary's far-right Jobbik party.

Two small opposition parties filed a criminal complaint against Ms Laszlo shortly after the video began circulating on social media on Tuesday.

Hungarian prosecutors said the criminal investigation will first centre on breach of peace offences.

"In the course of the investigation, the authorities will also examine if more serious crimes ... can be established," said Sandor Toro, the deputy chief prosecutor of Csongrad county.

A "wall of shame" page on Facebook featuring pictures, videos and commentary linked to the incident had gathered more than 30,000 likes by Thursday.

"You are a disgrace to your profession," one user wrote.

The incident occurred as hundreds of migrants broke through a police line at a collection point close to the Serbian border where thousands have been crossing each day for the past month.

"These are shocking images. You're part of a news agency," Aniko Bakonyi of human rights group Hungarian Helsinki Committee said.

"With your hand you're shooting and with your leg you're hurting someone else."

The video showed Ms Laszlo was "only kicking foreigners, no-one else, including a child who was clearly an asylum-seeker", Ms Bakonyi added.

"Since she's been working as a cameraperson there, she clearly knew who she was kicking," she said.

"It wasn't by accident, there is no mistake in that."

Ms Laszlo has not yet reacted publicly to the storm.

AFP