The clip shows three hooded attackers chasing AfD chief Frank Magnitz, 66, in Bremen on Monday before one of them floors him with a elbow to the head.
The anti-immigration Alternative for Germany claimed Magnitz, who heads up their local branch in the city, was targeted in an "attempted assassination".
Images were released showing the grisly head wound that the politician sustained in the attack.
His party claimed he “blacked out” after being hit with a plank of wood and was kicked repeatedly while on the ground.
The AfD have acknowledged that initial reports of the assault may not have been entirely accurate.
Cops are still hunting the attackers and have not made any arrests.
Magnitz's party says the attack was politically motivated, which police have said they are investigating, but not to the exclusion of other possibilities.
Authorities are investigating an online posting that briefly appeared on a far-left website claiming responsibility for the attack.
Bremen police said on Thursday they are examining whether the claim by a group calling itself "Anti-Fascist Spring" was genuine or not.
The post, which was deleted shortly after it appeared on the Indymedia website late on Wednesday, claimed Magnitz had been assaulted "in order to liberate him of his fascist ideas."
When were the AfD founded?
German Chancellor Angela Merkel has led condemnations of the assault with her spokesman saying on Twitter the "brutal attack" was to be "condemned sharply".
And Johannes Kahrs, from the Social Democrats, added that "violence is never acceptable" and "extremism in any form is rubbish" as he wished Magnitz a quick recovery.
An AfD office in Saxony was damaged by an explosive device left in a bin and three people were detained.
The party was founded in April 2013 ahead of that year’s federal elections in September.
Starting as an anti-euro party, the AfD was a reaction to the European debt crisis, which had seen Germany bailout some of the EU’s struggling economies.
Their first manifesto called for less centralised powers in Brussels and the scrapping of the Euro currency.
But despite an impressive showing in the 2013 election – winning 4.7 per cent of the vote – the AfD failed to gain the five per cent needed to enter the German parliament.
The party filled the space left by Chancellor Angela Merkel's conservative CDU, which has shifted towards the political centre.
But while the AfD capitalised on Europe’s economic discord, it was Merkel’s reaction to the refugee crisis that propelled the far-right party into the Bundestag lower house.
It is expected to attract even more votes in May's European elections.
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