Hi there
shall we say, I have had a few attempts at fitting a camera into model boats - with varying success.
The very first model which I ever fitted a camera to was HMS Leeds Castle. It was mounted into the observation tower/exhaust on the top of the bridge, and it had roughly 45 degrees of movement side to side through clear perspex windows. I had no issue with it fogging up or anything; the downside was the technology. You basically needed a small portable television with a video recorder input which you could plug the receiving module into.
When I got the hang of using this, I could steer the model via it by viewing it on the television screen. You did have to keep one eye on the model and one eye on the screen - as you did lose perspective of where you were on the lake due to lack of full view.
Good fun though - I did have this model at Wicksteed (the very first one) and I know the camera was fitted but I didn't use the camera/any set up as it was a bit of a faff on to set up.
The next one - I was on Youtube looking at how others set up their cameras etc. There are a couple of photographs of the modern camera/receiver/transmitter set up - + a little 7 inch t.v. screen. This all runs off between 8.4 and 12 volts. A lot better than the old system which the camera on the old system ran off a 9 volt battery; but you did have to have mains supply for the t.v. The new stuff which I have just mentioned above I am intending to fit into HMS Lindisfarne where I am thinking of mounting the camera in the little radar dome on the top of the bridge.
The next pic is of the Coaster - Morray Forth or is it Fifth

with a go-pro on - & this is mounted on the deck hatch. The only disadvantage of this is that you don't get to see what you are videoing/recording until you bring the model back to shore and view the images. It is pretty good but I did it so I could get some photographs/pictures of the wildlife (birds!) around the lake - and all I got was the images of shoes/feet/legs and the side of the lake as well.
Here are the photographs to show what I am taking about.