If I have understood correctly, this video of the incident involving Adam Haner and Marquise Love, in connection with which Mr Love is being sought by Portland Police, was taken by a man called Drew Hernandez. Here is his twitter post directing viewers to the YouTube channel where the video is hosted.
This Daily Mail story includes a much shorter (1 minute 49 seconds) video of the same incident.
Obviously, both videos show scenes of violence.
I am a strong believer in the presumption of innocence, so I will say no more than “Watch for yourselves”.
Edit: “It’s a stain on the movement”: Portland Protest Organizers Condemn Truck Driver Assault, reports the Portland Mercury. However at the time of writing the Twitter account of the national (US) Black Lives Matter movement has said nothing about it.