Video describes the purpose of the ark of the covenant.
Exodus 25:10-22
And they shall make an ark of acacia-wood: two cubits and a half shall be the length thereof, and a cubit and a half the breadth thereof, and a cubit and a half the height thereof. 11And thou shalt overlay it with pure gold, within and without shalt thou overlay it, and shalt make upon it a crown of gold round about. 12And thou shalt cast four rings of gold for it, and put them in the four feet thereof; and two rings shall be on the one side of it, and two rings on the other side of it. 13And thou shalt make staves of acacia-wood, and overlay them with gold. 14And thou shalt put the staves into the rings on the sides of the ark, wherewith to bear the ark. 15The staves shall be in the rings of the ark; they shall not be taken from it. 16And thou shalt put into the ark the testimony which I shall give thee. 17And thou shalt make an ark-cover of pure gold: two cubits and a half shall be the length thereof, and a cubit and a half the breadth thereof. 18And thou shalt make two cherubim of gold; of beaten work shalt thou make them, at the two ends of the ark-cover. 19And make one cherub at the one end, and one cherub at the other end; of one piece with the ark-cover shall ye make the cherubim of the two ends thereof. 20And the cherubim shall spread out their wings on high, screening the ark-cover with their wings, with their faces one to another; toward the ark-cover shall the faces of the cherubim be. 21And thou shalt put the ark-cover above upon the ark; and in the ark thou shalt put the testimony that I shall give thee. 22And there I will meet with thee, and I will speak with thee from above the ark-cover, from between the two cherubim which are upon the ark of the testimony, of all things which I will give thee in commandment unto the children of Israel.