.bildplayer{
-webkit-filter: grayscale(70%); /* Für Chrome, Safari, Opera */
  filter: grayscale(70%);       /* Für andere Browser */
	transition: transform 0.3s ease; /* Glatter Übergang für die Vergrößerung */
	position: relative;
	z-index:0;
}

.bildplayer:hover {
 -webkit-filter: grayscale(0%); /* Für Chrome, Safari, Opera */
  filter: grayscale(0%);       /* Für andere Browser */
	transform: scale(1.1); /* Vergrößert das Bild um 10% (1.1 ist der Faktor) */
	position: relative;
	z-index:100;
}

#overlay {
  position: fixed; /* Sit on top of the page content */
  display: none; /* Hidden by default */
  width: 100%; /* Full width (cover the whole page) */
  height: 100%; /* Full height (cover the whole page) */
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0,0,0,0.5); /* Black background with opacity */
  z-index: 2; /* Specify a stack order in case you're using a different order for other elements */
  cursor: pointer; /* Add a pointer on hover */
}

<style>
#text{
  position: absolute;
  top: 50%;
  left: 50%;
  font-size: 50px;
  color: white;
  transform: translate(-50%,-50%);
  -ms-transform: translate(-50%,-50%);
}
</style>