I can see why you would want to, however i seriously do not recommend it. I can see why you would want to, however i seriously do not recommend it. Yes it looks cool snapping shut, so why not film it on your cell phone once and then leave the plant be.
Most Venus Flytraps are more than capable of catching flies, even in an isolated windowsill. They do not absolutely require anything from the fly as they get almost all of their energy from the sun. It is possible to overfeed a trap. It will become tired and damaged and will eventually die.