Few things that came to mind after looking at the video
1. The man is quite overweight , he would not be able to run away from the police
2. He is wearing shorts and T-shirt , not much he could conceal , his hand are visible and he's not carrying any weapon
3. After he gets taken down , he does not try to resist , just keeps saying 'I can't breathe , I can't breathe'
The police didn't let go of the choke hold even when the man was down , subdued and finding it difficult to breathe.
This is in-voluntary manslaughter , the police could never get away with such acts in the UK or other European countries , thats for sure.
America definitely has a problem with its police using excessive force against Black people