need some help with a transition

Sup forum,

I have been having this problem quite some time and tonight I thought posting this and here it is.Idk how to tell this in english but I will try

https://2img.net/r/ihimg/photo/my-images/827/54949292.png

I dont want this border to be black, if its possible I want those 2 pictures to be connected and blurred in between as a transition.

I don't know, what exactly you mean but right-click the Clips with the border and then go on Properties. Then Uncheck the Box under "Loop" and deactivate Resampling. If that shouldn't work out just crop it out.
And if you want those 2 pictures be connected just pull the second Picture at the end of the first one and it should collide.