KWIKplayer allows you to choose your player's aspect ratio when contructing it by adding the "apectratio" directive and assigning it to your desired value.
The aspectratio varibale takes a string which is representative of width-to-height ratio.
Below is an example of assigning the player an aspect ratio of "16:9":
<script>
...
aspectratio: "16:9", //the player's aspect ratio
sources: [ //the video sources
{file:"https://clvod.itworkscdn.net/itwvod/smil:itwfcdn/admin/515002-R204MDrB22W6kG8.smil/playlist.m3u8"},
{file: "https://clvod.itworkscdn.net/itwvod/smil:itwfcdn/admin/515002-R204MDrB22W6kG8.smil/manifest.mpd"},
{file: "https://clvod.itworkscdn.net/itwvod/smil:itwfcdn/admin/515002-R204MDrB22W6kG8.smil/Manifest"}],
...
</script>