Impliment parent class's hover css to its child tag hover css

Try this

.videos-holder figure  figcaption:hover{
    -webkit-filter: grayscale(0%); 
    filter: grayscale(0%);
     -webkit-transition: .2s; /* Safari */
    transition: .2s;
}

Replace to

.videos-holder figure:hover  figcaption{
    -webkit-filter: grayscale(0%); 
    filter: grayscale(0%);
     -webkit-transition: .2s; /* Safari */
    transition: .2s;
}