To support thumbnail seeking, you need provide a smaller compressed video Url. Your can use ffmpeg to compress the video
ffmpeg -I 2048-stereo.mp4 -vf "scale=-1:110" -c:v libx264 -crf 28 -preset veryfast -an -movflags faststart sintel-thumbnail.mp

To customize the Player, use `PlayerConfiguration`.
struct PlayerConfiguration {
let controlsDismissTimeout: TimeInterval // in seconds
let stepInterval: Int // every step is 5 seconds, if specify 2, player will forward / backward 10 seconds every step
let scrubber: ScrubberConfiguration
let seekbarStyle: SeekBarStyle
let style: PLayerStyle
}

struct PLayerStyle {
let playImage: Image
let pauseImage: Image
let goforwardImage: Image
let gobackwardImage: Image
let optionsImage: Image
let optionCheckmarkImage: Image
let accentColor: Color
let borderColor: Color
let backgrounColor: Color
let playPauseButtonSize: CGSize
let forwardBackwordButtonSize: CGSize
let airplayButtonSize: CGSize
let pipButtonSize: CGSize
let optionsButtonSize: CGSize
let optionsMenuMinSize: CGSize
let optionsMenuCornerRadius: CGFloat
let optionsMenuBackgroundColor: Color
let optionsMenuTextColor: Color
}

public struct SeekBarStyle {
let scrubberStyle: ScrubberStyle
let thumbnailHeight: CGFloat
let timeFont: Font
}

struct ScrubberStyle {
let height: CGFloat
let padding: CGFloat
let cornerRadius: CGFloat
let backgroundColor: Color
let highlightColor: Color
let outlineWidth: CGFloat
let outlineColor: Color
}

public struct VolumeBarStyle {
let scrubberStyle: ScrubberStyle
let mutedImage: Image
let volume1Image: Image
let volume2Image: Image
let volume3Image: Image
let buttonSize: CGSize
}