its a trumpet sound with some sort of damping/volume reduction, maybe even a compressor... easily achievable in any synthesizer that has a trumpet preset on it. It might even be sidechained to the pad or beat. Try these ideas out and get back to me if nothing works.
The sound reminds me of Roland synths. I have a vague memory of a friend with an old Juno that had a patch like this. I can sort of mimic it with my DX7. The key is that there should be some high pass filter opening as part of the attack envelop (if you are using subtractive synthesis).
For FM, if you start with a decent brass patch (has some internal detuning to make it more vibrant), figure out which operator is most responsible for the presence of overtones and edit the shape of the envelope to something like the following levels: 90, 100, 100, 0, and make the first rate near instant and the second about an 8th of a second? (Guessing. Same sort of envelope for the hp filter if using subtractive synthesis instead of FM.) It is the slightly slower expansion of overtones in the second stage that strikes me as most characteristic of the sound I'm hearing in the video.