I have created a new creative template in DFP with html and I need to play a video with VAST code. Is that possible ?

For example this is the creativity that I created :

with this code :

and this is line in DFP with VAST example code :

my vast code :

https://pubads.g.doubleclick.net/gampad/ads?sz=640x480&iu=/124319096/external/single_ad_samples&ciu_szs=300x250&impl=s&gdfp_req=1&env=vp&output=vast&unviewed_position_start=1&cust_params=deployment%3Ddevsite%26sample_ct%3Dskippablelinear&correlator=