Is it OK to hump a pillow? Is it OK if you record yourself masturbating and delete it afterward so no one will see it?
"Humping" is a form of masturbating. Instead of rubbing your penis with your hands, you rub your penis against something else, such as the bed or a pillow. See: Is masturbation considered a sin?
You still need to clean up after you ejaculate and washing a pillow is more difficult than washing your shorts or sheets, but it isn't impossible.
The problem with recording yourself is that despite your intentions, the chances of a recording getting into the wrong hands is higher than you think. Private matters, such as using the toilet, showering or masturbating ought to remain private.