I recently bought a GoPRO Hero 3+ Silver to mount it on my LEGO train ( much like this ) but then I found it wasn’t really simple to attach it to LEGO.
So I used one of the bases they give you with the camera and used five plates to build something like the above image. Now you can simply attach it to your LEGO vehicle and enjoy it!
Here you have a video of the train.
Compare how it looks like a standard camera ( Samsung Galaxy S4 ).
As you see the result is impressive. Expensive but awesome camera.
Remember to brace your camera correctly if the vehicle is going to move a lot. You don’t want to see it on the floor.