On Friday, nine South African policemen were charged with murder over Mr Macia's death.
The video shows Mr Macia struggling with police after apparently parking his vehicle illegally.
According to media in Mozambique, Mr Macia will be buried outside the Mozambican capital, Maputo, on Saturday.
Mido Macia, 27, died of head injuries and internal bleeding after his arrest in Daveyton, east of Johannesburg.
Mr Macia, a taxi driver, was reportedly detained for parking his vehicle in a way that blocked traffic.
Video footage of Mr Macia being dragged behind the van caused widespread revulsion when it emerged last month.
Mido Macia, 27, died of head injuries and internal bleeding after his arrest.
Mido Macia, who was 27, was laid to rest in his native Mozambique.
Mr Macia's wife and parents were among the distraught mourners at Saturday's service.
The police service said it would give its full support to the IPID as it looked into Mr Macia's death.
The announcement comes after public uproar over the death of the man, identified by police as taxi driver Mido Macia.
Justin Ndlovu, the chair of the Benoni Taxi Association, said he knew Mr Macia and had last seen him last week.
The video shows Mr Macia struggling with police on 26 February after apparently parking his vehicle illegally in Daveyton, east of Johannesburg.
Mr Tshole said medical experts would show that Mr Macia's injuries were sustained in the accident and that he died of "natural causes".
The police service said it would give its full support to the Independent Police Investigative Directorate as it looked into Mr Macia's death.
An investigation was launched after video footage emerged showing Mr Macia being hauled through the streets with his hands cuffed to a police van.
Many present expressed anger towards those responsible for Mr Macia's death.
Hundreds of mourners attended the memorial service in Daveyton, where last week Mr Macia was reportedly detained for parking his vehicle in a way that blocked traffic.
Mr Macia later died in police custody, the prosecution alleges.
The court was told on Friday that Mr Macia had suffered extensive injuries, culminating in hypoxia - a lack of oxygen supply to the body - causing his death.
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