I don't know a meaning of "Nakusu" in this phrase. Can someone help me with this?
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So the sentence is about accidents at "railway crossings" (踏切の事故). And we are doing something to them "by finding people using a camera" (カメラで人を見つけて). What might you be able to do about accidents using a camera? One logical answer is to "get rid" of them / "eliminate" them etc. Sounds a bit like "lose" don't you think? So a translation could be
We will eliminate accidents at level crossings by using a camera that finds/detects people.