Try this:
import wixData from 'wix-data'
$w.onReady(async () => {
let results
try {
results = await wixData.query('OrchestralXylophone').find()
} catch (error) {
console.log(error)
}
$w('#listRepeater').data = results.items
$w('#container1').onClick(({ context }) => {
let data = $w('#listRepeater').data
let clickedItemData = data.find((item) => item._id === context.itemId)
$w('#videoPlayer1').src = clickedItemData.videoUrl
$w('#videoPlayer1').togglePlay()
$w('#listRepeater').forEachItem(($item) => {
$item('#box1').style.backgroundColor =
clickedItemData.videoUrl === $w('#videoPlayer1').videoUrl
? '#ffffff'
: '#ffcc37'
})
})
})