Of course it is possible to mount cameras on trains and/or vehicles in scale H0 (1:87). In Miniatur Wunderland Hamburg they have several DVDs and Videos with interesting scenes to watch. It looks nice! Have a look at this video too: => click.
I'm sure that the output could be streamed (do you mean a life-stream?) to the internet. A problem could be the transfer between the train/vehicle and the server, fi. in tunnels, hidden areas/mountains aso.
Kind regards from Germany
Watch the Wunderland shop to look for different DVDs