Car DVR files have 2 videostreams, premere uses first one. How i change it to use second one?

I don't think this is possible in Premiere Pro unfortunately.  I played around with this and could not find a way to the select the desired video track.  You'll probably need to use ffmpeg on the command line like this:

ffmpeg -i input.mp4 -c copy -map 0:1 output.mp4

ffmpeg is pretty deep, but I'll at least explain the above... -i specifies an input file, -c specifies what codec to use (copy means don't re-encode), -map selects which stream to use (0:0 is the first and 0:1 is the second), and finally -o specifies the output file.

Hope this helps!