A health or life bar is used to display a character's health in many video games. A typical life bar is a horizontal rectangle which begins full of color. If damage is taken or mistakes are made, the colored fill area gradually reduces and leave behind a visible outline as empty, typically from one end to another .... When the bar is completely emptied, the result is game over (death, being knocked out, etc.) or lose a life.
The not-quite-real quality of the graphics, the paucity of crewmen on the flight deck, and (especially) the health/ammunition status indicator in the bottom right-hand corner of the screen give this clip away as a sequence from a video game, in this case Battlefield 2.